* Merged changes up to eAthena 15054. [ai4rei]

* clif cleanup: Changed argument types of some clif functions.
- Added enumeration for skill failure codes and made clif_skill_fail use it.

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@15472 54d463be-8e91-2dee-dedb-b68131a5f0ec

7 files changed, 262 insertions, 173 deletions

diff --git a/src/map/clif.c b/src/map/clif.c
index fc859497f..4224e3777 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -3200,7 +3200,7 @@ void clif_changeoption2(struct block_list* bl)
 /*==========================================
  *
  *------------------------------------------*/
-void clif_useitemack(struct map_session_data *sd,int index,int amount,int ok)
+void clif_useitemack(struct map_session_data *sd,int index,int amount,bool ok)
 {
 	nullpo_retv(sd);
 
@@ -4489,7 +4489,7 @@ void clif_skillcastcancel(struct block_list* bl)
 /// if(success!=0) doesn't display any of the previous messages
 /// Note: when this packet is received an unknown flag is always set to 0,
 /// suggesting this is an ACK packet for the UseSkill packets and should be sent on success too [FlavioJS]
-void clif_skill_fail(struct map_session_data *sd,int skill_id,int type,int btype)
+void clif_skill_fail(struct map_session_data *sd,int skill_id,enum useskill_fail_cause cause,int btype)
 {
 	int fd;
 
@@ -4504,7 +4504,7 @@ void clif_skill_fail(struct map_session_data *sd,int skill_id,int type,int btype
 	if(battle_config.display_skill_fail&1)
 		return; //Disable all skill failed messages
 
-	if(type==0x4 && !sd->state.showdelay)
+	if(cause==USESKILL_FAIL_SKILLINTERVAL && !sd->state.showdelay)
 		return; //Disable delay failed messages
 	
 	if(skill_id == RG_SNATCHER && battle_config.display_skill_fail&4)
@@ -4518,7 +4518,7 @@ void clif_skill_fail(struct map_session_data *sd,int skill_id,int type,int btype
 	WFIFOW(fd,2) = skill_id;
 	WFIFOL(fd,4) = btype;
 	WFIFOB(fd,8) = 0;// success
-	WFIFOB(fd,9) = type;
+	WFIFOB(fd,9) = cause;
 	WFIFOSET(fd,packet_len(0x110));
 }
 
@@ -5472,7 +5472,7 @@ void clif_item_repair_list(struct map_session_data *sd,struct map_session_data *
 		sd->menuskill_id = BS_REPAIRWEAPON;
 		sd->menuskill_val = dstsd->bl.id;
 	}else
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 }
 void clif_item_repaireffect(struct map_session_data *sd,int nameid,int flag)
 {
@@ -9072,13 +9072,13 @@ void clif_parse_Emotion(int fd, struct map_session_data *sd)
 
 	if (battle_config.basic_skill_check == 0 || pc_checkskill(sd, NV_BASIC) >= 2) {
 		if (emoticon == E_MUTE) {// prevent use of the mute emote [Valaris]
-			clif_skill_fail(sd, 1, 0, 1);
+			clif_skill_fail(sd, 1, USESKILL_FAIL_LEVEL, 1);
 			return;
 		}
 		// fix flood of emotion icon (ro-proxy): flood only the hacker player
 		if (sd->emotionlasttime >= time(NULL)) {
 			sd->emotionlasttime = time(NULL) + 1; // not more than 1 per second (using /commands the client can spam it)
-			clif_skill_fail(sd, 1, 0, 1);
+			clif_skill_fail(sd, 1, USESKILL_FAIL_LEVEL, 1);
 			return;
 		}
 		sd->emotionlasttime = time(NULL) + 1; // not more than 1 per second (using /commands the client can spam it)
@@ -9090,7 +9090,7 @@ void clif_parse_Emotion(int fd, struct map_session_data *sd)
 
 		clif_emotion(&sd->bl, emoticon);
 	} else
-		clif_skill_fail(sd, 1, 0, 1);
+		clif_skill_fail(sd, 1, USESKILL_FAIL_LEVEL, 1);
 }
 
 /*==========================================
@@ -9139,7 +9139,7 @@ void clif_parse_ActionRequest_sub(struct map_session_data *sd, int action_type,
 
 		if (!battle_config.sdelay_attack_enable && pc_checkskill(sd, SA_FREECAST) <= 0) {
 			if (DIFF_TICK(tick, sd->ud.canact_tick) < 0) {
-				clif_skill_fail(sd, 1, 4, 0);
+				clif_skill_fail(sd, 1, USESKILL_FAIL_SKILLINTERVAL, 0);
 				return;
 			}
 		}
@@ -9150,7 +9150,7 @@ void clif_parse_ActionRequest_sub(struct map_session_data *sd, int action_type,
 	break;
 	case 0x02: // sitdown
 		if (battle_config.basic_skill_check && pc_checkskill(sd, NV_BASIC) < 3) {
-			clif_skill_fail(sd, 1, 0, 2);
+			clif_skill_fail(sd, 1, USESKILL_FAIL_LEVEL, 2);
 			break;
 		}
 
@@ -9674,7 +9674,7 @@ void clif_parse_CreateChatRoom(int fd, struct map_session_data* sd)
 	if (sd->sc.data[SC_NOCHAT] && sd->sc.data[SC_NOCHAT]->val1&MANNER_NOROOM)
 		return;
 	if(battle_config.basic_skill_check && pc_checkskill(sd,NV_BASIC) < 4) {
-		clif_skill_fail(sd,1,0,3);
+		clif_skill_fail(sd,1,USESKILL_FAIL_LEVEL,3);
 		return;
 	}
 
@@ -9786,7 +9786,7 @@ void clif_parse_TradeRequest(int fd,struct map_session_data *sd)
 
 	if( battle_config.basic_skill_check && pc_checkskill(sd,NV_BASIC) < 1)
 	{
-		clif_skill_fail(sd,1,0,0);
+		clif_skill_fail(sd,1,USESKILL_FAIL_LEVEL,0);
 		return;
 	}
 	
@@ -9974,7 +9974,7 @@ static void clif_parse_UseSkillToPos_mercenary(struct mercenary_data *md, struct
 		return;
 	if( DIFF_TICK(tick, md->ud.canact_tick) < 0 )
 	{
-		clif_skill_fail(md->master, skillnum, 4, 0);
+		clif_skill_fail(md->master, skillnum, USESKILL_FAIL_SKILLINTERVAL, 0);
 		return;
 	}
 
@@ -10044,7 +10044,7 @@ void clif_parse_UseSkillToId(int fd, struct map_session_data *sd)
 	{
 		if( sd->skillitem != skillnum )
 		{
-			clif_skill_fail(sd, skillnum, 4, 0);
+			clif_skill_fail(sd, skillnum, USESKILL_FAIL_SKILLINTERVAL, 0);
 			return;
 		}
 	}
@@ -10120,7 +10120,7 @@ void clif_parse_UseSkillToPosSub(int fd, struct map_session_data *sd, short skil
 	{
 		if( pc_issit(sd) )
 		{
-			clif_skill_fail(sd, skillnum, 0, 0);
+			clif_skill_fail(sd, skillnum, USESKILL_FAIL_LEVEL, 0);
 			return;
 		}
 		//You can't use Graffiti/TalkieBox AND have a vending open, so this is safe.
@@ -10134,7 +10134,7 @@ void clif_parse_UseSkillToPosSub(int fd, struct map_session_data *sd, short skil
 	{
 		if( sd->skillitem != skillnum )
 		{
-			clif_skill_fail(sd, skillnum, 4, 0);
+			clif_skill_fail(sd, skillnum, USESKILL_FAIL_SKILLINTERVAL, 0);
 			return;
 		}
 	}
@@ -10242,7 +10242,7 @@ void clif_parse_ProduceMix(int fd,struct map_session_data *sd)
 		return;
 	if (pc_istrading(sd)) {
 		//Make it fail to avoid shop exploits where you sell something different than you see.
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 		sd->menuskill_val = sd->menuskill_id = 0;
 		return;
 	}
@@ -10264,7 +10264,7 @@ void clif_parse_Cooking(int fd,struct map_session_data *sd)
 
 	if (pc_istrading(sd)) {
 		//Make it fail to avoid shop exploits where you sell something different than you see.
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 		sd->menuskill_val = sd->menuskill_id = 0;
 		return;
 	}
@@ -10280,7 +10280,7 @@ void clif_parse_RepairItem(int fd, struct map_session_data *sd)
 		return;
 	if (pc_istrading(sd)) {
 		//Make it fail to avoid shop exploits where you sell something different than you see.
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 		sd->menuskill_val = sd->menuskill_id = 0;
 		return;
 	}
@@ -10299,7 +10299,7 @@ void clif_parse_WeaponRefine(int fd, struct map_session_data *sd)
 		return;
 	if (pc_istrading(sd)) {
 		//Make it fail to avoid shop exploits where you sell something different than you see.
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 		sd->menuskill_val = sd->menuskill_id = 0;
 		return;
 	}
@@ -10400,7 +10400,7 @@ void clif_parse_SelectArrow(int fd,struct map_session_data *sd)
 {
 	if (pc_istrading(sd)) {
 	//Make it fail to avoid shop exploits where you sell something different than you see.
-		clif_skill_fail(sd,sd->ud.skillid,0,0);
+		clif_skill_fail(sd,sd->ud.skillid,USESKILL_FAIL_LEVEL,0);
 		sd->menuskill_val = sd->menuskill_id = 0;
 		return;
 	}
@@ -10627,7 +10627,7 @@ void clif_parse_CreateParty(int fd, struct map_session_data *sd)
 	}
 	if( battle_config.basic_skill_check && pc_checkskill(sd,NV_BASIC) < 7 )
 	{
-		clif_skill_fail(sd,1,0,4);
+		clif_skill_fail(sd,1,USESKILL_FAIL_LEVEL,4);
 		return;
 	}
 
@@ -10648,7 +10648,7 @@ void clif_parse_CreateParty2(int fd, struct map_session_data *sd)
 	}
 	if( battle_config.basic_skill_check && pc_checkskill(sd,NV_BASIC) < 7 )
 	{
-		clif_skill_fail(sd,1,0,4);
+		clif_skill_fail(sd,1,USESKILL_FAIL_LEVEL,4);
 		return;
 	}
 
diff --git a/src/map/clif.h b/src/map/clif.h
index cf6578c5c..29e870185 100644
--- a/src/map/clif.h
+++ b/src/map/clif.h
@@ -215,6 +215,90 @@ enum map_type
 	MAPTYPE_UNUSED               = 29,
 };
 
+enum useskill_fail_cause
+{// clif_skill_fail
+	USESKILL_FAIL_LEVEL = 0,
+	USESKILL_FAIL_SP_INSUFFICIENT = 1,
+	USESKILL_FAIL_HP_INSUFFICIENT = 2,
+	USESKILL_FAIL_STUFF_INSUFFICIENT = 3,
+	USESKILL_FAIL_SKILLINTERVAL = 4,
+	USESKILL_FAIL_MONEY = 5,
+	USESKILL_FAIL_THIS_WEAPON = 6,
+	USESKILL_FAIL_REDJAMSTONE = 7,
+	USESKILL_FAIL_BLUEJAMSTONE = 8,
+	USESKILL_FAIL_WEIGHTOVER = 9,
+	USESKILL_FAIL = 10,
+	USESKILL_FAIL_TOTARGET = 11,
+	USESKILL_FAIL_ANCILLA_NUMOVER = 12,
+	USESKILL_FAIL_HOLYWATER = 13,
+	USESKILL_FAIL_ANCILLA = 14,
+	USESKILL_FAIL_DUPLICATE_RANGEIN = 15,
+	USESKILL_FAIL_NEED_OTHER_SKILL = 16,
+	USESKILL_FAIL_NEED_HELPER = 17,
+	USESKILL_FAIL_INVALID_DIR = 18,
+	USESKILL_FAIL_SUMMON = 19,
+	USESKILL_FAIL_SUMMON_NONE = 20,
+	USESKILL_FAIL_IMITATION_SKILL_NONE = 21,
+	USESKILL_FAIL_DUPLICATE = 22,
+	USESKILL_FAIL_CONDITION = 23,
+	USESKILL_FAIL_PAINTBRUSH = 24,
+	//XXX_USESKILL_FAIL_II_SURFACE_PAINTS = 25,
+	USESKILL_FAIL_POS = 26,
+	USESKILL_FAIL_HELPER_SP_INSUFFICIENT = 27,
+	//XXX_USESKILL_FAIL_II_NECK_CANDY = 28,
+	//XXX_USESKILL_FAIL_II_MISERABLE_TEAR = 29,
+	//XXX_USESKILL_FAIL_II_PROTECT_NECK_CANDY = 30,
+	USESKILL_FAIL_GC_WEAPONBLOCKING = 31,
+	USESKILL_FAIL_GC_POISONINGWEAPON = 32,
+	USESKILL_FAIL_MADOGEAR = 33,
+	//XXX_USESKILL_FAIL_II_VULCANBULLET = 34,
+	//XXX_USESKILL_FAIL_II_FUELGAS = 35,
+	//XXX_USESKILL_FAIL_II_COLDSLOWERBULLET = 36,
+	USESKILL_FAIL_CANONBALL = 37,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_ACCELERATION = 38,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_HOVERING_BOOSTER = 39,
+	USESKILL_FAIL_MADOGEAR_HOVERING = 40,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_SELFDESTRUCTION_DEVICE = 41,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_SHAPESHIFTER = 42,
+	USESKILL_FAIL_GUILLONTINE_POISON = 43,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_COOLING_DEVICE = 44,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_MAGNETICFIELD_GENERATOR = 45,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_BARRIER_GENERATOR = 46,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_OPTICALCAMOUFLAGE_GENERATOR = 47,
+	//XXX_USESKILL_FAIL_II_MADOGEAR_REPAIRKIT = 48,
+	//XXX_USESKILL_FAIL_II_MONKEY_SPANNER = 49,
+	USESKILL_FAIL_MADOGEAR_RIDE = 50,
+	USESKILL_FAIL_SPELLBOOK = 51,
+	USESKILL_FAIL_SPELLBOOK_DIFFICULT_SLEEP = 52,
+	USESKILL_FAIL_SPELLBOOK_PRESERVATION_POINT = 53,
+	USESKILL_FAIL_SPELLBOOK_READING = 54,
+	//XXX_USESKILL_FAIL_II_FACE_PAINTS = 55,
+	//XXX_USESKILL_FAIL_II_MAKEUP_BRUSH = 56,
+	USESKILL_FAIL_CART = 57,
+	//XXX_USESKILL_FAIL_II_THORNS_SEED = 58,
+	//XXX_USESKILL_FAIL_II_BLOOD_SUCKER_SEED = 59,
+	USESKILL_FAIL_NO_MORE_SPELL = 60,
+	//XXX_USESKILL_FAIL_II_BOMB_MUSHROOM_SPORE = 61,
+	//XXX_USESKILL_FAIL_II_GASOLINE_BOOMB = 62,
+	//XXX_USESKILL_FAIL_II_OIL_BOTTLE = 63,
+	//XXX_USESKILL_FAIL_II_EXPLOSION_POWDER = 64,
+	//XXX_USESKILL_FAIL_II_SMOKE_POWDER = 65,
+	//XXX_USESKILL_FAIL_II_TEAR_GAS = 66,
+	//XXX_USESKILL_FAIL_II_HYDROCHLORIC_ACID_BOTTLE = 67,
+	//XXX_USESKILL_FAIL_II_HELLS_PLANT_BOTTLE = 68,
+	//XXX_USESKILL_FAIL_II_MANDRAGORA_FLOWERPOT = 69,
+	USESKILL_FAIL_MANUAL_NOTIFY = 70,
+	USESKILL_FAIL_NEED_ITEM = 71,
+	USESKILL_FAIL_NEED_EQUIPMENT = 72,
+	USESKILL_FAIL_COMBOSKILL = 73,
+	USESKILL_FAIL_SPIRITS = 74,
+	USESKILL_FAIL_EXPLOSIONSPIRITS = 75,
+	USESKILL_FAIL_HP_TOOMANY = 76,
+	USESKILL_FAIL_NEED_ROYAL_GUARD_BANDING = 77,
+	USESKILL_FAIL_NEED_EQUIPPED_WEAPON_CLASS = 78,
+	USESKILL_FAIL_EL_SUMMON = 79,
+};
+
 int clif_setip(const char* ip);
 void clif_setbindip(const char* ip);
 void clif_setport(uint16 port);
@@ -272,7 +356,7 @@ void clif_unequipitemack(struct map_session_data *sd,int n,int pos,int ok);	// s
 void clif_misceffect(struct block_list* bl,int type);	// area
 void clif_changeoption(struct block_list* bl);	// area
 void clif_changeoption2(struct block_list* bl);	// area
-void clif_useitemack(struct map_session_data *sd,int index,int amount,int ok);	// self
+void clif_useitemack(struct map_session_data *sd,int index,int amount,bool ok);	// self
 void clif_GlobalMessage(struct block_list* bl, const char* message);
 void clif_createchat(struct map_session_data* sd, int flag);	// self
 void clif_dispchat(struct chat_data* cd, int fd);	// area or fd
@@ -327,12 +411,12 @@ void clif_class_change(struct block_list *bl,int class_,int type);
 void clif_skillinfoblock(struct map_session_data *sd);
 void clif_skillup(struct map_session_data *sd,int skill_num);
 void clif_skillinfo(struct map_session_data *sd,int skill, int inf);
-void clif_addskill(struct map_session_data *sd, int skill);
-void clif_deleteskill(struct map_session_data *sd, int skill);
+void clif_addskill(struct map_session_data *sd, int id);
+void clif_deleteskill(struct map_session_data *sd, int id);
 
 void clif_skillcasting(struct block_list* bl, int src_id, int dst_id, int dst_x, int dst_y, int skill_num, int property, int casttime);
 void clif_skillcastcancel(struct block_list* bl);
-void clif_skill_fail(struct map_session_data *sd,int skill_id,int type,int btype);
+void clif_skill_fail(struct map_session_data *sd,int skill_id,enum useskill_fail_cause cause,int btype);
 void clif_skill_cooldown(struct map_session_data *sd, int skillid, unsigned int tick);
 int clif_skill_damage(struct block_list *src,struct block_list *dst,unsigned int tick,int sdelay,int ddelay,int damage,int div,int skill_id,int skill_lv,int type);
 //int clif_skill_damage2(struct block_list *src,struct block_list *dst,unsigned int tick,int sdelay,int ddelay,int damage,int div,int skill_id,int skill_lv,int type);
diff --git a/src/map/guild.c b/src/map/guild.c
index 28d4c7062..335d77301 100644
--- a/src/map/guild.c
+++ b/src/map/guild.c
@@ -1049,7 +1049,7 @@ int guild_change_emblem(struct map_session_data *sd,int len,const char *data)
 
 	if (battle_config.require_glory_guild &&
 		!((g = guild_search(sd->status.guild_id)) && guild_checkskill(g, GD_GLORYGUILD)>0)) {
-		clif_skill_fail(sd,GD_GLORYGUILD,0,0);
+		clif_skill_fail(sd,GD_GLORYGUILD,USESKILL_FAIL_LEVEL,0);
 		return 0;
 	}
 
diff --git a/src/map/pc.c b/src/map/pc.c
index 6f10e88a7..9978f711c 100644
--- a/src/map/pc.c
+++ b/src/map/pc.c
@@ -3957,16 +3957,16 @@ int pc_useitem(struct map_session_data *sd,int n)
 	script = sd->inventory_data[n]->script;
 	//Check if the item is to be consumed immediately [Skotlex]
 	if( sd->inventory_data[n]->flag.delay_consume )
-		clif_useitemack(sd,n,amount,1);
+		clif_useitemack(sd,n,amount,true);
 	else
 	{
 		if( sd->status.inventory[n].expire_time == 0 )
 		{
-			clif_useitemack(sd,n,amount-1,1);
+			clif_useitemack(sd,n,amount-1,true);
 			pc_delitem(sd,n,1,1,0,LOG_TYPE_CONSUME); // Rental Usable Items are not deleted until expiration
 		}
 		else
-			clif_useitemack(sd,n,0,0);
+			clif_useitemack(sd,n,0,false);
 	}
 	if(sd->status.inventory[n].card[0]==CARD0_CREATE &&
 		pc_famerank(MakeDWord(sd->status.inventory[n].card[2],sd->status.inventory[n].card[3]), MAPID_ALCHEMIST))
diff --git a/src/map/skill.c b/src/map/skill.c
index de5b34f1e..0545c09c1 100644
--- a/src/map/skill.c
+++ b/src/map/skill.c
@@ -498,7 +498,7 @@ int skillnotok (int skillid, struct map_session_data *sd)
 		case WZ_ICEWALL:
 			// noicewall flag [Valaris]
 			if (map[m].flag.noicewall) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				return 1;
 			}
 			break;
@@ -514,7 +514,7 @@ int skillnotok (int skillid, struct map_session_data *sd)
 				!(battle_config.emergency_call&(map[m].flag.gvg || map[m].flag.gvg_castle?8:4)) ||
 				(battle_config.emergency_call&16 && map[m].flag.nowarpto && !map[m].flag.gvg_castle)
 			)	{
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				return 1;
 			}
 			break;
@@ -714,7 +714,7 @@ int skill_additional_effect (struct block_list* src, struct block_list *bl, int
 				if(pc_steal_item(sd,bl,pc_checkskill(sd,TF_STEAL)))
 					clif_skill_nodamage(src,bl,TF_STEAL,skill,1);
 				else
-					clif_skill_fail(sd,RG_SNATCHER,0,0);
+					clif_skill_fail(sd,RG_SNATCHER,USESKILL_FAIL_LEVEL,0);
 			}
 			// Chance to trigger Taekwon kicks [Dralnu]
 			if(sc && !sc->data[SC_COMBO]) {
@@ -777,7 +777,7 @@ int skill_additional_effect (struct block_list* src, struct block_list *bl, int
 		if(!sc_start(bl,SC_POISON,(4*skilllv+10),skilllv,skill_get_time2(skillid,skilllv))
 			&&	sd && skillid==TF_POISON
 		)
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		break;
 
 	case AS_SONICBLOW:
@@ -2650,12 +2650,12 @@ static int skill_check_condition_mercenary(struct block_list *bl, int skill, int
 	{
 		if( hp > 0 && status->hp <= (unsigned int)hp )
 		{
-			clif_skill_fail(sd, skill, 2, 0);
+			clif_skill_fail(sd, skill, USESKILL_FAIL_HP_INSUFFICIENT, 0);
 			return 0;
 		}
 		if( sp > 0 && status->sp <= (unsigned int)sp )
 		{
-			clif_skill_fail(sd, skill, 1, 0);
+			clif_skill_fail(sd, skill, USESKILL_FAIL_SP_INSUFFICIENT, 0);
 			return 0;
 		}
 	}
@@ -2666,7 +2666,7 @@ static int skill_check_condition_mercenary(struct block_list *bl, int skill, int
 			case ST_MOVE_ENABLE:
 				if( !unit_can_move(bl) )
 				{
-					clif_skill_fail(sd, skill, 0, 0);
+					clif_skill_fail(sd, skill, USESKILL_FAIL_LEVEL, 0);
 					return 0;
 				}
 				break;
@@ -2682,7 +2682,7 @@ static int skill_check_condition_mercenary(struct block_list *bl, int skill, int
 		index[i] = pc_search_inventory(sd, itemid[i]);
 		if( index[i] < 0 || sd->status.inventory[index[i]].amount < amount[i] )
 		{
-			clif_skill_fail(sd, skill, 0, 0);
+			clif_skill_fail(sd, skill, USESKILL_FAIL_LEVEL, 0);
 			return 0;
 		}
 	}
@@ -3225,7 +3225,7 @@ int skill_castend_damage_id (struct block_list* src, struct block_list *bl, int
 				unit_setdir(bl,dir);
 			}
 			else if (sd)
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 
@@ -3582,7 +3582,7 @@ int skill_castend_damage_id (struct block_list* src, struct block_list *bl, int
 	case SL_STUN:
 		if (sd && !battle_config.allow_es_magic_pc && bl->type != BL_MOB) {
 			status_change_start(src,SC_STUN,10000,skilllv,0,0,0,500,10);
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		skill_attack(BF_MAGIC,src,src,bl,skillid,skilllv,tick,flag);
@@ -4105,7 +4105,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	switch (skillid) {
 		case HLIF_HEAL:	//[orn]
 			if (bl->type != BL_HOM) {
-				if (sd) clif_skill_fail(sd,skillid,0,0) ;
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0) ;
 	        break ;
 			}
  		case AL_HEAL:
@@ -4120,7 +4120,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if (sd && battle_check_undead(tstatus->race,tstatus->def_ele)) {
 				if (battle_check_target(src, bl, BCT_ENEMY) < 1) {
 				  	//Offensive heal does not works on non-enemies. [Skotlex]
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 					return 0;
 				}
 				return skill_castend_damage_id (src, bl, skillid, skilllv, tick, flag);
@@ -4199,7 +4199,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case PR_REDEMPTIO:
 		if (sd && !(flag&1)) {
 			if (sd->status.party_id == 0) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			skill_area_temp[0] = 0;
@@ -4208,7 +4208,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				src,skillid,skilllv,tick, flag|BCT_PARTY|1,
 				skill_castend_nodamage_id);
 			if (skill_area_temp[0] == 0) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			skill_area_temp[0] = 5 - skill_area_temp[0]; // The actual penalty...
@@ -4230,7 +4230,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case ALL_RESURRECTION:
 		if(sd && (map_flag_gvg(bl->m) || map[bl->m].flag.battleground))
 		{	//No reviving in WoE grounds!
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		if (!status_isdead(bl))
@@ -4396,7 +4396,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			int class_;
 			if ( sd && dstmd->status.mode&MD_BOSS )
 			{
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			class_ = skillid==SA_MONOCELL?1002:mob_get_random_id(2, 1, 0);
@@ -4415,7 +4415,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case SA_DEATH:
 		if ( sd && dstmd && dstmd->status.mode&MD_BOSS )
 		{
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		clif_skill_nodamage(src,bl,skillid,skilllv,1);
@@ -4441,7 +4441,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case CR_PROVIDENCE:
 		if(sd && dstsd){ //Check they are not another crusader [Skotlex]
 			if ((dstsd->class_&MAPID_UPPERMASK) == MAPID_CRUSADER) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				map_freeblock_unlock();
 				return 1;
 			}
@@ -4456,7 +4456,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 
 			if( sd && dstsd && (dstsd->class_&MAPID_UPPERMASK) == MAPID_BARDDANCER && dstsd->status.sex == sd->status.sex )
 			{// Cannot cast on another bard/dancer-type class of the same gender as caster
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				map_freeblock_unlock();
 				return 1;
 			}
@@ -4479,7 +4479,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				else
 				{
 					if( sd )
-						clif_skill_fail(sd,skillid,0,0);
+						clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 
 					map_freeblock_unlock();
 					return 1;
@@ -4509,7 +4509,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 					dstsd->sc.data[SC_ENCPOISON]
 				))
 				) {
-				if (sd) clif_skill_fail(sd,skillid,0,0);
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				clif_skill_nodamage(src,bl,skillid,skilllv,0);
 				break;
 			}
@@ -4517,7 +4517,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		// 100% success rate at lv4 & 5, but lasts longer at lv5
 		if(!clif_skill_nodamage(src,bl,skillid,skilllv, sc_start(bl,type,(60+skilllv*10),skilllv, skill_get_time(skillid,skilllv)))) {
 			if (sd)
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			if (skill_break_equip(bl, EQP_WEAPON, 10000, BCT_PARTY) && sd && sd != dstsd)
 				clif_displaymessage(sd->fd,"You broke target's weapon");
 		}
@@ -4683,7 +4683,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		break;
 	case HP_ASSUMPTIO:
 		if( sd && dstmd )
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		else
 			clif_skill_nodamage(src,bl,skillid,skilllv,
 				sc_start(bl,type,100,skilllv,skill_get_time(skillid,skilllv)));
@@ -4741,7 +4741,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			//	dstsd->sc.data[SC_ENCPOISON] //People say you should be able to recast to lengthen the timer. [Skotlex]
 			) {
 					clif_skill_nodamage(src,bl,skillid,skilllv,0);
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 					break;
 			}
 		}
@@ -4764,12 +4764,12 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			int id;
 			if (sd->mission_mobid && (sd->mission_count || rand()%100)) { //Cannot change target when already have one
 				clif_mission_info(sd, sd->mission_mobid, sd->mission_count);
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			id = mob_get_random_id(0,0xF, sd->status.base_level);
 			if (!id) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			sd->mission_mobid = id;
@@ -4804,7 +4804,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		if( !i )
 		{
 			if( sd )
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			map_freeblock_unlock();
 			return 0;
 		}
@@ -4833,7 +4833,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if( !dstsd || (!sd && !mer) )
 			{ // Only players can be devoted
 				if( sd )
-					clif_skill_fail(sd, skillid, 0, 0);
+					clif_skill_fail(sd, skillid, USESKILL_FAIL_LEVEL, 0);
 				break;
 			}
 
@@ -4846,7 +4846,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				(dstsd->sc.data[SC_HELLPOWER])) // Players affected by SC_HELLPOWERR cannot be devoted.
 			{
 				if( sd )
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				map_freeblock_unlock();
 				return 1;
 			}
@@ -4861,7 +4861,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 					ARR_FIND(0, count, i, sd->devotion[i] == 0 );
 					if( i == count )
 					{ // No free slots, skill Fail
-						clif_skill_fail(sd, skillid, 0, 0);
+						clif_skill_fail(sd, skillid, USESKILL_FAIL_LEVEL, 0);
 						map_freeblock_unlock();
 						return 1;
 					}
@@ -5107,7 +5107,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				dstsd->status.char_id == sd->status.child
 			)) {
 				status_change_start(src,SC_STUN,10000,skilllv,0,0,0,500,8);
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 		}
@@ -5164,7 +5164,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if( i )
 				clif_skill_nodamage(src,bl,skillid,( skillid == LG_FORCEOFVANGUARD ) ? skilllv : -1,i);
 			else if( sd )
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			map_freeblock_unlock();
 			return 0;
 		}
@@ -5172,7 +5172,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		if( i )
 			clif_skill_nodamage(src,bl,skillid,( skillid == LG_FORCEOFVANGUARD ) ? skilllv : -1,i);
 		else if( sd )
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		break;
 
 	case BD_ADAPTATION:
@@ -5213,7 +5213,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			else
 			{
 				clif_skill_nodamage(src,bl,skillid,skilllv,0);
-				if(sd) clif_skill_fail(sd,skillid,0,0);
+				if(sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			}
 		}
 		break;
@@ -5223,7 +5223,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if(pc_steal_item(sd,bl,skilllv))
 				clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			else
-				clif_skill_fail(sd,skillid,0x0a,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL,0);
 		}
 		break;
 
@@ -5237,14 +5237,14 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 
 			} 
 			else
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 
 	case MG_STONECURSE:
 		{
 			if (tstatus->mode&MD_BOSS) {
-				if (sd) clif_skill_fail(sd,skillid,0,0);
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			if(status_isimmune(bl) || !tsc)
@@ -5252,7 +5252,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 
 			if (tsc->data[SC_STONE]) {
 				status_change_end(bl, SC_STONE, INVALID_TIMER);
-				if (sd) clif_skill_fail(sd,skillid,0,0);
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			if (sc_start4(bl,SC_STONE,(skilllv*4+20),
@@ -5260,7 +5260,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				skill_get_time2(skillid,skilllv)))
 					clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			else if(sd) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				// Level 6-10 doesn't consume a red gem if it fails [celest]
 				if (skilllv > 5)
 				{ // not to consume items
@@ -5364,7 +5364,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			break;
 		if( dstsd )
 		{ // Fail on Players
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		if( dstmd && dstmd->class_ == MOBID_EMPERIUM )
@@ -5396,7 +5396,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		if(sd)
 		{	//Prevent vending of GMs with unnecessary Level to trade/drop. [Skotlex]
 			if ( !pc_can_give_items(pc_isGM(sd)) )
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			else {
 				sd->state.prevend = 1;
 				clif_openvendingreq(sd,2+skilllv);
@@ -5444,7 +5444,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if (skill_produce_mix(sd, skillid, 523, 0, 0, 0, 1))
 				clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			else
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 
@@ -5528,7 +5528,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 
 		//Nothing stripped.
 		if( sd && !i )
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 	}
 		break;
 
@@ -5547,13 +5547,13 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				i = pc_search_inventory(sd,skill_db[skillid].itemid[x]);
 				if(i < 0 || skill_db[skillid].itemid[x] <= 0)
 				{
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 					map_freeblock_unlock();
 					return 1;
 				}
 				if(sd->inventory_data[i] == NULL || sd->status.inventory[i].amount < skill_db[skillid].amount[x])
 				{
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 					map_freeblock_unlock();
 					return 1;
 				}
@@ -5561,7 +5561,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				{
 					if( dstsd && dstsd->status.base_level < (unsigned int)sd->inventory_data[i]->elv )
 					{
-						clif_skill_fail(sd,skillid,0,0);
+						clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 						map_freeblock_unlock();
 						return 1;
 					}
@@ -5654,7 +5654,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			//Prepare 200 White Potions.
 			if (!skill_produce_mix(sd, skillid, 504, 0, 0, 0, 200))
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 	case AM_TWILIGHT2:
@@ -5662,7 +5662,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			//Prepare 200 Slim White Potions.
 			if (!skill_produce_mix(sd, skillid, 547, 0, 0, 0, 200))
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 	case AM_TWILIGHT3:
@@ -5672,7 +5672,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				|| !skill_can_produce_mix(sd,7136,-1, 50) //50 Acid Bottle
 				|| !skill_can_produce_mix(sd,7135,-1, 50) //50 Flame Bottle
 			) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			clif_skill_nodamage(src,bl,skillid,skilllv,1);
@@ -5691,7 +5691,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				|| ( tsc && tsc->option&OPTION_MADOGEAR ) )//Mado Gear is immune to dispell according to bug report 49 [Ind]
 			{
 				if (sd)
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			if(status_isimmune(bl) || !tsc || !tsc->count)
@@ -5818,7 +5818,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 				{	//Only 10% success chance against bosses. [Skotlex]
 					if (rand()%100 < 90)
 					{
-						if (sd) clif_skill_fail(sd,skillid,0,0);
+						if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 						break;
 					}
 				} else if (!dstsd || map_flag_vs(bl->m)) //HP damage only on pvp-maps when against players.
@@ -6092,7 +6092,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			struct map_session_data *m_sd = pc_get_mother(sd);
 			// if neither was found
 			if(!f_sd && !m_sd){
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				map_freeblock_unlock();
 				return 0;
 			}
@@ -6108,7 +6108,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			hp = sstatus->max_hp/10;
 			sp = hp * 10 * skilllv / 100;
 			if (!status_charge(src,hp,0)) {
-				if (sd) clif_skill_fail(sd,skillid,0,0);
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 			clif_skill_nodamage(src, bl, skillid, skilllv, 1);
@@ -6204,7 +6204,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 
 	case AS_SPLASHER:
 		if(tstatus->mode&MD_BOSS || tstatus-> hp > tstatus->max_hp*3/4) {
-			if (sd) clif_skill_fail(sd,skillid,0,0);
+			if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			map_freeblock_unlock();
 			return 1;
 		}
@@ -6232,7 +6232,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if (!clif_skill_nodamage(src,bl,skillid,skilllv,
 				sc_start(bl,type,55+5*skilllv,skilllv,skill_get_time(skillid,skilllv))))
 			{
-				if (sd) clif_skill_fail(sd,skillid,0,0);
+				if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				map_freeblock_unlock();
 				return 0;
 			}
@@ -6256,7 +6256,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			unsigned int sp1 = 0, sp2 = 0;
 			if (dstmd) {
 				if (dstmd->state.soul_change_flag) {
-					if(sd) clif_skill_fail(sd,skillid,0,0);
+					if(sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 					break;
 				}
 				dstmd->state.soul_change_flag = 1;
@@ -6338,7 +6338,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if( rand() % 100 > skilllv * 8 || (dstmd && ((dstmd->guardian_data && dstmd->class_ == MOBID_EMPERIUM) || mob_is_battleground(dstmd))) )
 			{
 				if( sd )
-					clif_skill_fail(sd,skillid,0,0);
+					clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 
 				map_freeblock_unlock();
 				return 0;
@@ -6441,7 +6441,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case SL_WIZARD:
 		//NOTE: here, 'type' has the value of the associated MAPID, not of the SC_SPIRIT constant.
 		if (sd && !(dstsd && (dstsd->class_&MAPID_UPPERMASK) == type)) {
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		if (skillid == SL_SUPERNOVICE && dstsd && dstsd->die_counter && !(rand()%100))
@@ -6457,7 +6457,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		break;
 	case SL_HIGH:
 		if (sd && !(dstsd && (dstsd->class_&JOBL_UPPER) && !(dstsd->class_&JOBL_2) && dstsd->status.base_level < 70)) {
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		clif_skill_nodamage(src,bl,skillid,skilllv,
@@ -6473,7 +6473,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 	case SL_SKA: // [marquis007]
 	case SL_SKE:
 		if (sd && !battle_config.allow_es_magic_pc && bl->type != BL_MOB) {
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			status_change_start(src,SC_STUN,10000,skilllv,0,0,0,500,10);
 			break;
 		}
@@ -6565,7 +6565,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		if (sd) {
 			clif_skill_nodamage(src,bl,skillid,skilllv,1);
 			if (!pc_set_hate_mob(sd, skilllv-1, bl))
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 
@@ -6579,16 +6579,21 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		}
 		break;
 
-    case GS_CRACKER:
-        i =65 -5*distance_bl(src,bl); //Base rate
-        if (i < 30) i = 30;
-            clif_skill_nodamage(src,bl,skillid,skilllv,1);
-            sc_start(bl,SC_STUN, i,skilllv,skill_get_time2(skillid,skilllv));
-        break;
+	case GS_CRACKER:
+		if (!dstsd)	// according to latest patch, should not work on players [Reddozen]
+		{
+			i =65 -5*distance_bl(src,bl); //Base rate
+			if (i < 30) i = 30;
+			clif_skill_nodamage(src,bl,skillid,skilllv,1);
+			sc_start(bl,SC_STUN, i,skilllv,skill_get_time2(skillid,skilllv));
+		}
+		else if (sd)
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
+		break;
 
 	case AM_CALLHOMUN:	//[orn]
 		if (sd && !merc_call_homunculus(sd))
-			clif_skill_fail(sd,skillid,0,0);
+			clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		break;
 
 	case AM_REST:
@@ -6597,7 +6602,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 			if (merc_hom_vaporize(sd,1))
 				clif_skill_nodamage(src, bl, skillid, skilllv, 1);
 			else
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 		}
 		break;
 
@@ -6626,9 +6631,9 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, in
 		}
 		// Failed
 		else if (hd && hd->master)
-			clif_skill_fail(hd->master, skillid, 0, 0);
+			clif_skill_fail(hd->master, skillid, USESKILL_FAIL_LEVEL, 0);
 		else if (sd)
-			clif_skill_fail(sd, skillid, 0, 0);
+			clif_skill_fail(sd, skillid, USESKILL_FAIL_LEVEL, 0);
 		break;
 	case HVAN_CHAOTIC:	//[orn]
 		{
@@ -7667,7 +7672,7 @@ int skill_castend_id(int tid, unsigned int tick, int id, intptr_t data)
 				sc->data[SC_FOGWALL] &&
 				rand()%100 < 75)
 		  	{	//Fogwall makes all offensive-type targetted skills fail at 75%
-				if (sd) clif_skill_fail(sd,ud->skillid,0,0);
+				if (sd) clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 		}
@@ -7686,7 +7691,7 @@ int skill_castend_id(int tid, unsigned int tick, int id, intptr_t data)
 			!check_distance_bl(src, target, skill_get_range2(src,ud->skillid,ud->skilllv)+battle_config.skill_add_range))
 		{
 			if (sd) {
-				clif_skill_fail(sd,ud->skillid,0,0);
+				clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 				if(battle_config.skill_out_range_consume) //Consume items anyway. [Skotlex]
 					skill_consume_requirement(sd,ud->skillid,ud->skilllv,3);
 			}
@@ -7806,7 +7811,7 @@ int skill_castend_id(int tid, unsigned int tick, int id, intptr_t data)
 				clif_slide(src,src->x,src->y);
 				clif_skill_damage(src,target,tick,sd->battle_status.amotion,0,0,1,ud->skillid, ud->skilllv, 5);
 			}
-			clif_skill_fail(sd,ud->skillid,0,0);
+			clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 		}
 	}
 
@@ -7867,7 +7872,7 @@ int skill_castend_pos(int tid, unsigned int tick, int id, intptr_t data)
 			skill_check_unit_range(src,ud->skillx,ud->skilly,ud->skillid,ud->skilllv)
 		  )
 		{
-			if (sd) clif_skill_fail(sd,ud->skillid,0,0);
+			if (sd) clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		if( src->type&battle_config.skill_nofootset &&
@@ -7875,7 +7880,7 @@ int skill_castend_pos(int tid, unsigned int tick, int id, intptr_t data)
 			skill_check_unit_range2(src,ud->skillx,ud->skilly,ud->skillid,ud->skilllv)
 		  )
 		{
-			if (sd) clif_skill_fail(sd,ud->skillid,0,0);
+			if (sd) clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 			break;
 		}
 		if( src->type&battle_config.land_skill_limit &&
@@ -7888,7 +7893,7 @@ int skill_castend_pos(int tid, unsigned int tick, int id, intptr_t data)
 			}
 			if( maxcount == 0 )
 			{
-				if (sd) clif_skill_fail(sd,ud->skillid,0,0);
+				if (sd) clif_skill_fail(sd,ud->skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 		}
@@ -8253,7 +8258,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, int skillid, int sk
 			int j = pc_search_inventory(sd,skill_db[skillid].itemid[i]);
 			if( j < 0 || skill_db[skillid].itemid[i] <= 0 || sd->inventory_data[j] == NULL || sd->status.inventory[j].amount < skill_db[skillid].amount[i] )
 			{
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				return 1;
 			}
 			potion_flag = 1;
@@ -8309,7 +8314,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, int skillid, int sk
 			i = skill_get_splash(skillid, skilllv);
 			map_foreachinarea(skill_cell_overlap, src->m, x-i, y-i, x+i, y+i, BL_SKILL, HW_GANBANTEIN, &dummy, src);
 		} else {
-			if (sd) clif_skill_fail(sd,skillid,0,0);
+			if (sd) clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			return 1;
 		}
 		break;
@@ -8326,12 +8331,12 @@ int skill_castend_pos2(struct block_list* src, int x, int y, int skillid, int sk
 			int i;
 			if( map_count_oncell(src->m,x,y,BL_CHAR) > 0 )
 			{
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				return 1;
 			}
 			clif_skill_poseffect(src,skillid,skilllv,x,y,tick);
 			if (rand()%100 < 50) {
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 			} else {
 				TBL_MOB* md = mob_once_spawn_sub(src, src->m, x, y, "--ja--",(skilllv < 2 ? 1084+rand()%2 : 1078+rand()%6),"");
 				if (!md) break;
@@ -8381,7 +8386,7 @@ int skill_castend_pos2(struct block_list* src, int x, int y, int skillid, int sk
 		{
 			if (!merc_resurrect_homunculus(sd, 20*skilllv, x, y))
 			{
-				clif_skill_fail(sd,skillid,0,0);
+				clif_skill_fail(sd,skillid,USESKILL_FAIL_LEVEL,0);
 				break;
 			}
 		}
@@ -8626,7 +8631,7 @@ int skill_castend_map (struct map_session_data *sd, short skill_num, const char
 
 			mapindex  = mapindex_name2id((char*)map);
 			if(!mapindex) { //Given map not found?
-				clif_skill_fail(sd,skill_num,0,0);
+				clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 				skill_failed(sd);
 				return 0;
 			}
@@ -8641,7 +8646,7 @@ int skill_castend_map (struct map_session_data *sd, short skill_num, const char
 						maxcount--;
 				}
 				if(!maxcount) {
-					clif_skill_fail(sd,skill_num,0,0);
+					clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 					skill_failed(sd);
 					return 0;
 				}
@@ -10348,7 +10353,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 
 	if( pc_is90overweight(sd) )
 	{
-		clif_skill_fail(sd,skill,9,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_WEIGHTOVER,0);
 		return 0;
 	}
 
@@ -10375,7 +10380,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	{
 	case SA_CASTCANCEL:
 		if(sd->ud.skilltimer == INVALID_TIMER) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10387,7 +10392,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		break;
 	case MO_CALLSPIRITS:
 		if(sd->spiritball >= lv) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10438,7 +10443,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		}
 		else if( !unit_can_move(&sd->bl) )
 	  	{	//Placed here as ST_MOVE_ENABLE should not apply if rooted or on a combo. [Skotlex]
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10446,7 +10451,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case TK_MISSION:
 		if( (sd->class_&MAPID_UPPERMASK) != MAPID_TAEKWON )
 		{// Cannot be used by Non-Taekwon classes
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10458,7 +10463,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case TK_JUMPKICK:
 		if( (sd->class_&MAPID_UPPERMASK) == MAPID_SOUL_LINKER )
 		{// Soul Linkers cannot use this skill
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10491,7 +10496,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 			int time;
 			if(!(sc && sc->data[SC_DANCING]))
 			{
-				clif_skill_fail(sd,skill,0,0);
+				clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 			time = 1000*(sc->data[SC_DANCING]->val3>>16);
@@ -10500,7 +10505,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 				(sc->data[SC_DANCING]->val1>>16)) //Dance Skill LV
 				- time < skill_get_time2(skill,lv))
 			{
-				clif_skill_fail(sd,skill,0,0);
+				clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 		}
@@ -10509,7 +10514,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case PR_BENEDICTIO:
 		if (skill_check_pc_partner(sd, skill, &lv, 1, 0) < 2)
 		{
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10527,7 +10532,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case CG_HERMODE:
 		if(!npc_check_areanpc(1,sd->bl.m,sd->bl.x,sd->bl.y,skill_get_splash(skill, lv)))
 		{
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10539,7 +10544,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 				x = sd->bl.x+(i%size-range);
 				y = sd->bl.y+(i/size-range);
 				if (map_getcell(sd->bl.m,x,y,CELL_CHKWALL)) {
-					clif_skill_fail(sd,skill,0,0);
+					clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 					return 0;
 				}
 			}
@@ -10550,7 +10555,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 			int exp;
 			if( ((exp = pc_nextbaseexp(sd)) > 0 && get_percentage(sd->status.base_exp, exp) < 1) ||
 				((exp = pc_nextjobexp(sd)) > 0 && get_percentage(sd->status.job_exp, exp) < 1)) {
-				clif_skill_fail(sd,skill,0,0); //Not enough exp.
+				clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0); //Not enough exp.
 				return 0;
 			}
 			break;
@@ -10559,7 +10564,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case AM_TWILIGHT3:
 		if (!party_skill_check(sd, sd->status.party_id, skill, lv))
 		{
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10571,7 +10576,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		i = skill-SG_SUN_WARM;
 		if (sd->bl.m == sd->feel_map[i].m)
 			break;
-		clif_skill_fail(sd,skill,0,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 		return 0;
 		break;
 	case SG_SUN_COMFORT:
@@ -10583,7 +10588,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		if (sd->bl.m == sd->feel_map[i].m &&
 			(battle_config.allow_skill_without_day || sg_info[i].day_func()))
 			break;
-		clif_skill_fail(sd,skill,0,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 		return 0;
 	case SG_FUSION:
 		if (sc && sc->data[SC_SPIRIT] && sc->data[SC_SPIRIT]->val2 == SL_STAR)
@@ -10593,7 +10598,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		if( require.sp > 0 )
 		{
 			if (status->sp < (unsigned int)require.sp)
-				clif_skill_fail(sd,skill,1,0);
+				clif_skill_fail(sd,skill,USESKILL_FAIL_SP_INSUFFICIENT,0);
 			else
 				status_zap(&sd->bl, 0, require.sp);
 		}
@@ -10602,7 +10607,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	case GD_REGENERATION:
 	case GD_RESTORE:
 		if (!map_flag_gvg2(sd->bl.m)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 	case GD_EMERGENCYCALL:
@@ -10613,26 +10618,26 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 
 	case GS_GLITTERING:
 		if(sd->spiritball >= 10) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 
 	case NJ_ISSEN:
 		if (status->hp < 2) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 	case NJ_BUNSINJYUTSU:
 		if (!(sc && sc->data[SC_NEN])) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 	  	}
 		break;
 
 	case NJ_ZENYNAGE:
 		if(sd->status.zeny < require.zeny) {
-			clif_skill_fail(sd,skill,5,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_MONEY,0);
 			return 0;
 		}
 		break;
@@ -10642,14 +10647,14 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 		break;
 	case AM_CALLHOMUN: //Can't summon if a hom is already out
 		if (sd->status.hom_id && sd->hd && !sd->hd->homunculus.vaporize) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case AM_REST: //Can't vapo homun if you don't have an active homunc or it's hp is < 80%
 		if (!merc_is_hom_active(sd->hd) || sd->hd->battle_status.hp < (sd->hd->battle_status.max_hp*80/100))
 		{
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10786,66 +10791,66 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	switch(require.state) {
 	case ST_HIDING:
 		if(!(sc && sc->option&OPTION_HIDE)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_CLOAKING:
 		if(!pc_iscloaking(sd)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_HIDDEN:
 		if(!pc_ishiding(sd)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_RIDING:
 		if(!pc_isriding(sd)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_FALCON:
 		if(!pc_isfalcon(sd)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_CARTBOOST:
 		if(!(sc && sc->data[SC_CARTBOOST])) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 	case ST_CART:
 		if(!pc_iscarton(sd)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_SHIELD:
 		if(sd->status.shield <= 0) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_SIGHT:
 		if(!(sc && sc->data[SC_SIGHT])) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_EXPLOSIONSPIRITS:
 		if(!(sc && sc->data[SC_EXPLOSIONSPIRITS])) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
 	case ST_RECOV_WEIGHT_RATE:
 		if(battle_config.natural_heal_weight_rate <= 100 && sd->weight*100/sd->max_weight >= (unsigned int)battle_config.natural_heal_weight_rate) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10854,7 +10859,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 			sd->ud.canmove_tick = gettick(); //When using a combo, cancel the can't move delay to enable the skill. [Skotlex]
 
 		if (!unit_can_move(&sd->bl)) {
-			clif_skill_fail(sd,skill,0,0);
+			clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 		break;
@@ -10863,7 +10868,7 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 			break;
 		if (map_getcell(sd->bl.m,sd->bl.x,sd->bl.y,CELL_CHKWATER))
 			break;
-		clif_skill_fail(sd,skill,0,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 		return 0;
 	/**
 	 * Rune Knight
@@ -10915,27 +10920,27 @@ int skill_check_condition_castbegin(struct map_session_data* sd, short skill, sh
 	if(require.mhp > 0 && get_percentage(status->hp, status->max_hp) > require.mhp) {
 		//mhp is the max-hp-requirement, that is,
 		//you must have this % or less of HP to cast it.
-		clif_skill_fail(sd,skill,2,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_HP_INSUFFICIENT,0);
 		return 0;
 	}
 
 	if( require.weapon && !pc_check_weapontype(sd,require.weapon) ) {
-		clif_skill_fail(sd,skill,6,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_THIS_WEAPON,0);
 		return 0;
 	}
 
 	if( require.sp > 0 && status->sp < (unsigned int)require.sp) {
-		clif_skill_fail(sd,skill,1,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_SP_INSUFFICIENT,0);
 		return 0;
 	}
 
 	if( require.zeny > 0 && sd->status.zeny < require.zeny ) {
-		clif_skill_fail(sd,skill,5,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_MONEY,0);
 		return 0;
 	}
 
 	if( require.spiritball > 0 && sd->spiritball < require.spiritball) {
-		clif_skill_fail(sd,skill,0,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 		return 0;
 	}
 
@@ -10980,7 +10985,7 @@ int skill_check_condition_castend(struct map_session_data* sd, short skill, shor
 
 	if( pc_is90overweight(sd) )
 	{
-		clif_skill_fail(sd,skill,9,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_WEIGHTOVER,0);
 		return 0;
 	}
 
@@ -11007,7 +11012,7 @@ int skill_check_condition_castend(struct map_session_data* sd, short skill, shor
 			if(c >= maxcount ||
 				(skill==AM_CANNIBALIZE && c != i && battle_config.summon_flora&2))
 			{	//Fails when: exceed max limit. There are other plant types already out.
-				clif_skill_fail(sd,skill,0,0);
+				clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 		}
@@ -11046,7 +11051,7 @@ int skill_check_condition_castend(struct map_session_data* sd, short skill, shor
 	require = skill_get_requirement(sd,skill,lv);
 
 	if( require.hp > 0 && status->hp <= (unsigned int)require.hp) {
-		clif_skill_fail(sd,skill,2,0);
+		clif_skill_fail(sd,skill,USESKILL_FAIL_HP_INSUFFICIENT,0);
 		return 0;
 	}
 
@@ -11062,7 +11067,7 @@ int skill_check_condition_castend(struct map_session_data* sd, short skill, shor
 		{	//Ammo type check. Send the "wrong weapon type" message
 			//which is the closest we have to wrong ammo type. [Skotlex]
 			clif_arrow_fail(sd,0); //Haplo suggested we just send the equip-arrows message instead. [Skotlex]
-			//clif_skill_fail(sd,skill,6,0);
+			//clif_skill_fail(sd,skill,USESKILL_FAIL_THIS_WEAPON,0);
 			return 0;
 		}
 	}
@@ -11074,11 +11079,11 @@ int skill_check_condition_castend(struct map_session_data* sd, short skill, shor
 		index[i] = pc_search_inventory(sd,require.itemid[i]);
 		if( index[i] < 0 || sd->status.inventory[index[i]].amount < require.amount[i] ) {
 			if( require.itemid[i] == ITEMID_RED_GEMSTONE )
-				clif_skill_fail(sd,skill,7,0);// red gemstone required
+				clif_skill_fail(sd,skill,USESKILL_FAIL_REDJAMSTONE,0);// red gemstone required
 			else if( require.itemid[i] == ITEMID_BLUE_GEMSTONE )
-				clif_skill_fail(sd,skill,8,0);// blue gemstone required
+				clif_skill_fail(sd,skill,USESKILL_FAIL_BLUEJAMSTONE,0);// blue gemstone required
 			else
-				clif_skill_fail(sd,skill,0,0);
+				clif_skill_fail(sd,skill,USESKILL_FAIL_LEVEL,0);
 			return 0;
 		}
 	}
@@ -11711,7 +11716,7 @@ void skill_repairweapon (struct map_session_data *sd, int idx)
 	else
 		material = materials [2]; // Armors consume 1 Steel
 	if (pc_search_inventory(sd,material) < 0 ) {
-		clif_skill_fail(sd,sd->menuskill_id,0,0);
+		clif_skill_fail(sd,sd->menuskill_id,USESKILL_FAIL_LEVEL,0);
 		return;
 	}
 	clif_skill_nodamage(&sd->bl,&target_sd->bl,sd->menuskill_id,1,1);
@@ -11764,7 +11769,7 @@ void skill_weaponrefine (struct map_session_data *sd, int idx)
 			||  ditem->flag.no_refine 	// if the item isn't refinable
 			||  (i = pc_search_inventory(sd, material [ditem->wlv])) < 0 )
 			{
-				clif_skill_fail(sd,sd->menuskill_id,0,0);
+				clif_skill_fail(sd,sd->menuskill_id,USESKILL_FAIL_LEVEL,0);
 				return;
 			}
 
diff --git a/src/map/unit.c b/src/map/unit.c
index 72e6fe2d6..05b8d2e39 100644
--- a/src/map/unit.c
+++ b/src/map/unit.c
@@ -1058,7 +1058,7 @@ int unit_skilluse_id2(struct block_list *src, int target_id, short skill_num, sh
 				return 0;
 			target = (struct block_list*)map_charid2sd(sd->status.partner_id);
 			if (!target) {
-				clif_skill_fail(sd,skill_num,0,0);
+				clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 			break;
@@ -1110,7 +1110,7 @@ int unit_skilluse_id2(struct block_list *src, int target_id, short skill_num, sh
 		case BD_ENCORE:
 			//Prevent using the dance skill if you no longer have the skill in your tree. 
 			if(!sd->skillid_dance || pc_checkskill(sd,sd->skillid_dance)<=0){
-				clif_skill_fail(sd,skill_num,0,0);
+				clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 			sd->skillid_old = skill_num;
@@ -1126,7 +1126,7 @@ int unit_skilluse_id2(struct block_list *src, int target_id, short skill_num, sh
 		case CG_MOONLIT:
 			if (skill_check_pc_partner(sd, skill_num, &skill_lv, 1, 0) < 1)
 			{
-				clif_skill_fail(sd,skill_num,0,0);
+				clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 				return 0;
 			}
 			break;
@@ -1356,7 +1356,7 @@ int unit_skilluse_pos2( struct block_list *src, short skill_x, short skill_y, sh
 
 	if( map_getcell(src->m, skill_x, skill_y, CELL_CHKWALL) )
 	{// can't cast ground targeted spells on wall cells
-		if (sd) clif_skill_fail(sd,skill_num,0,0);
+		if (sd) clif_skill_fail(sd,skill_num,USESKILL_FAIL_LEVEL,0);
 		return 0;
 	}
 
@@ -1691,7 +1691,7 @@ static int unit_attack_timer_sub(struct block_list* src, int tid, unsigned int t
 	{ // attacking when under cast delay has restrictions:
 		if( tid == INVALID_TIMER )
 		{ //requested attack.
-			if(sd) clif_skill_fail(sd,1,4,0);
+			if(sd) clif_skill_fail(sd,1,USESKILL_FAIL_SKILLINTERVAL,0);
 			return 0;
 		}
 		//Otherwise, we are in a combo-attack, delay this until your canact time is over. [Skotlex]
diff --git a/src/map/vending.c b/src/map/vending.c
index 38c817139..0db4ee85b 100644
--- a/src/map/vending.c
+++ b/src/map/vending.c
@@ -254,14 +254,14 @@ void vending_openvending(struct map_session_data* sd, const char* message, bool
 	// skill level and cart check
 	if( !vending_skill_lvl || !pc_iscarton(sd) )
 	{
-		clif_skill_fail(sd, MC_VENDING, 0, 0);
+		clif_skill_fail(sd, MC_VENDING, USESKILL_FAIL_LEVEL, 0);
 		return;
 	}
 
 	// check number of items in shop
 	if( count < 1 || count > MAX_VENDING || count > 2 + vending_skill_lvl )
 	{	// invalid item count
-		clif_skill_fail(sd, MC_VENDING, 0, 0);
+		clif_skill_fail(sd, MC_VENDING, USESKILL_FAIL_LEVEL, 0);
 		return;
 	}
 
@@ -296,7 +296,7 @@ void vending_openvending(struct map_session_data* sd, const char* message, bool
 
 	if( i == 0 )
 	{	// no valid item found
-		clif_skill_fail(sd, MC_VENDING, 0, 0); // custom reply packet
+		clif_skill_fail(sd, MC_VENDING, USESKILL_FAIL_LEVEL, 0); // custom reply packet
 		return;
 	}
 	sd->state.prevend = 0;