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+# Monster skill database
+
+<!--
+## Copyright
+> This file is part of Hercules.
+> http://herc.ws - http://github.com/HerculesWS/Hercules
+> 
+> Copyright (C) 2020 Hercules Dev Team
+> Copyright (C) Zarbony
+> Copyright (C) Kenpachi
+> 
+> Hercules is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+> 
+> This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+> See the GNU General Public License for more details.
+>
+> You should have received a copy of the GNU General Public License along with this program.  
+> If not, see <http://www.gnu.org/licenses/>.
+-->
+
+## Description
+This file is a documentation for the monster skill database files.
+ * [db/mob_skill_db2.conf](../db/mob_skill_db2.conf)
+ * [db/pre-re/mob_skill_db.conf](../db/pre-re/mob_skill_db.conf)
+ * [db/re/mob_skill_db.conf](../db/re/mob_skill_db.conf)
+
+--------------------------------------------------------------
+
+## Entry structure
+```
+	<Monster_Constant>: {
+		<Skill_Constant>: {
+			ClearSkills:
+			SkillLevel:
+			SkillState:
+			SkillTarget:
+			Rate:
+			CastTime:
+			Delay:
+			Cancelable:
+			CastCondition:
+			ConditionData:
+			val0:
+			val1:
+			val2:
+			val3:
+			val4:
+			Emotion:
+			ChatMsgID:
+		}
+	}
+```
+
+--------------------------------------------------------------
+
+## Field list
+
+Name             | Data type | Default value
+:--------------- | :-------- | :------------
+Monster_Constant | constant  | No default value
+Skill_Constant   | constant  | No default value
+ClearSkills      | boolean   | false
+SkillLevel       | int       | 1
+SkillState       | string    | "MSS_ANY"
+SkillTarget      | string    | "MST_TARGET"
+Rate             | int       | 1
+CastTime         | int       | 0
+Delay            | int       | 0
+Cancelable       | boolean   | false
+CastCondition    | string    | "MSC_ALWAYS"
+ConditionData    | int       | 0
+val0             | int       | 0
+val1             | int       | 0
+val2             | int       | 0
+val3             | int       | 0
+val4             | int       | 0
+Emotion          | int       | -1
+ChatMsgID        | int       | 0
+
+--------------------------------------------------------------
+
+## Field explanation
+
+### Monster_Constant
+The monster's name constant, found in [mob_db.conf](../db/re/mob_db.conf) as *SpriteName*.  
+There are 3 special constants for global skill assignment:  
+* `ALL_MOBS`: Add skills to all monsters.
+* `ALL_MOBS_BOSS`: Add skills to all boss monsters.
+* `ALL_MOBS_NONBOSS`: Add skills to all non-boss monsters.
+
+### Skill_Constant
+The skill's name constant, found in [skill_db.conf](../db/re/skill_db.conf) as *Name*.  
+Note: You can add multiple Skill_Constant blocks.
+
+### ClearSkills
+If set to `true`, all previously defined skills for this monster will be removed.
+
+### SkillLevel
+The skill level which should be used.  
+Minimum value is `1`. Maximum value is `mob_max_skilllvl` from [conf/map/battle/skill.conf](../conf/map/battle/skill.conf#L318).
+
+### SkillState
+Defines in which state the monster is able to cast the skill.
+State         | Description
+:------------ | :----------
+MSS_ANY       | Monster is in any state except `MSS_DEAD`.
+MSS_IDLE      | Monster has no target and isn't walking.
+MSS_WALK      | Monster is walking.
+MSS_LOOT      | Monster is looting or walking to loot.
+MSS_DEAD      | Monster is dying.
+MSS_BERSERK   | Monster is attacking after starting the battle.
+MSS_ANGRY     | Monster is attacking after being attacked.
+MSS_RUSH      | Monster is following an enemy after being attacked.
+MSS_FOLLOW    | Monster is following an enemy without being attacked.
+MSS_ANYTARGET | Same as `MSS_ANY` but monster must have a target.
+
+### SkillTarget
+Defines the skill's target.
+Target      | Description
+:---------- | :----------
+MST_TARGET  | The monster's current target.
+MST_RANDOM  | A random enemy within skill range.
+MST_SELF    | The monster itself.
+MST_FRIEND  | A random friend within skill range. If no friend was found, `MST_SELF` is used.
+MST_MASTER  | The monster's master. If no master was found, `MST_FRIEND` is used.
+MST_AROUND1 | Random cell within a range of `1`. (Affects ground skills only.)
+MST_AROUND2 | Random cell within a range of `2`. (Affects ground skills only.)
+MST_AROUND3 | Random cell within a range of `3`. (Affects ground skills only.)
+MST_AROUND4 | Random cell within a range of `4`. (Affects ground skills only.)
+MST_AROUND5 | Same as `MST_AROUND1`, but the monster's current target must be in skill range.
+MST_AROUND6 | Same as `MST_AROUND2`, but the monster's current target must be in skill range.
+MST_AROUND7 | Same as `MST_AROUND3`, but the monster's current target must be in skill range.
+MST_AROUND8 | Same as `MST_AROUND4`, but the monster's current target must be in skill range.
+MST_AROUND  | Same as `MST_AROUND4`.
+
+### Rate
+The chance of successfully casting the skill if the condition is fulfilled. (10000 = 100%)  
+Minimum value is `1`. Maximum value is `10000`.
+
+### CastTime
+The skill's cast time in milliseconds.  
+Minimum value is `0`. Maximum value is `MOB_MAX_CASTTIME` from [src/map/mob.c](../src/map/mob.c#L81).
+
+### Delay
+The time in milliseconds before attempting to cast the same skill again.  
+Minimum value is `0`. Maximum value is `MOB_MAX_DELAY` from [src/map/mob.c](../src/map/mob.c#L82).
+
+### Cancelable
+Defines whether the skill is cancelable or not.
+
+### CastCondition
+Defines the condition to successfully cast the skill.
+Condition             | Description
+:-------------------- | :----------
+MSC_ALWAYS            | No condition.
+MSC_MYHPLTMAXRATE     | Monster's HP in percent is less than or equal to `ConditionData`.
+MSC_MYHPINRATE        | Monster's HP in percent is greater than or equal to `ConditionData` and less than or equal to `val0`.
+MSC_FRIENDHPLTMAXRATE | Friend's HP in percent is less than or equal to `ConditionData`.
+MSC_FRIENDHPINRATE    | Friend's HP in percent is greater than or equal to `ConditionData` and less than or equal to `val0`.
+MSC_MYSTATUSON        | Monster has status change `ConditionData` enabled. (See [doc/constants.md](./constants.md#Status-Changes) for a list of available status changes.)
+MSC_MYSTATUSOFF       | Monster has status change `ConditionData` disabled. (See [doc/constants.md](./constants.md#Status-Changes) for a list of available status changes.)
+MSC_FRIENDSTATUSON    | Friend has status change `ConditionData` enabled. (See [doc/constants.md](./constants.md#Status-Changes) for a list of available status changes.)
+MSC_FRIENDSTATUSOFF   | Friend has status change `ConditionData` disabled. (See [doc/constants.md](./constants.md#Status-Changes) for a list of available status changes.)
+MSC_ATTACKPCGT        | Monster is attacked by more than `ConditionData` units.
+MSC_ATTACKPCGE        | Monster is attacked by `ConditionData` or more units.
+MSC_SLAVELT           | Monster has less than `ConditionData` slaves.
+MSC_SLAVELE           | Monster has `ConditionData` or less active slaves.
+MSC_CLOSEDATTACKED    | Monster is melee attacked.
+MSC_LONGRANGEATTACKED | Monster is range attacked.
+MSC_AFTERSKILL        | Monster has used skill `ConditionData`. (If `ConditionData` is `0`, all skills are triggered.)
+MSC_SKILLUSED         | Skill `ConditionData` was used on the monster. (If `ConditionData` is `0`, all skills are triggered.)
+MSC_CASTTARGETED      | A skill is being cast on the monster.
+MSC_RUDEATTACKED      | Monster was rude attacked `RUDE_ATTACKED_COUNT` times. ([src/map/mob.c#L84](../src/map/mob.c))
+MSC_MASTERHPLTMAXRATE | The monster master's HP in percent is less than `ConditionData`.
+MSC_MASTERATTACKED    | The monster's master is attacked.
+MSC_ALCHEMIST         | The monster was summoned by an Alchemist class character.
+MSC_SPAWN             | The monster spawns.
+
+### ConditionData
+Additional cast condition data. Meaning depends on the situation. See `CastCondition` table.
+
+### val0
+Additional data. Meaning depends on the situation.
+ * `MSC_MYHPINRATE`/`MSC_FRIENDHPINRATE`: See `CastCondition` table.
+ * `NPC_SUMMONMONSTER`: Slave monster ID.
+ * `NPC_SUMMONSLAVE`: Slave monster ID.
+ * `NPC_METAMORPHOSIS`: Transform monster ID.
+ * `NPC_EMOTION`: Emotion ID. (See [doc/constants.md](./constants.md#emotes) for a list of available emotions.)
+ * `NPC_EMOTION_ON`: Emotion ID. (See [doc/constants.md](./constants.md#emotes) for a list of available emotions.)
+
+### val1
+Additional data. Meaning depends on the situation.
+ * `NPC_SUMMONMONSTER`: Slave monster ID.
+ * `NPC_SUMMONSLAVE`: Slave monster ID.
+ * `NPC_METAMORPHOSIS`: Transform monster ID.
+ * `NPC_EMOTION`: Monster's mode is changed to specified value.
+ * `NPC_EMOTION_ON`: Monster's mode is changed to specified value.
+
+### val2
+Additional data. Meaning depends on the situation.
+ * `NPC_SUMMONMONSTER`: Slave monster ID.
+ * `NPC_SUMMONSLAVE`: Slave monster ID.
+ * `NPC_METAMORPHOSIS`: Transform monster ID.
+
+### val3
+Additional data. Meaning depends on the situation.
+ * `NPC_SUMMONMONSTER`: Slave monster ID.
+ * `NPC_SUMMONSLAVE`: Slave monster ID.
+ * `NPC_METAMORPHOSIS`: Transform monster ID.
+
+### val4
+Additional data. Meaning depends on the situation.
+ * `NPC_SUMMONMONSTER`: Slave monster ID.
+ * `NPC_SUMMONSLAVE`: Slave monster ID.
+ * `NPC_METAMORPHOSIS`: Transform monster ID.
+
+### Emotion
+The ID of the emotion the monster will use when casting the skill.  
+(See [doc/constants.md](./constants.md#emotes) for a list of available emotions.)
+
+### ChatMsgID
+The ID of the message the monster will say when casting the skill.
+(See [db/mob_chat_db.txt](../db/mob_chat_db.txt) for a list of available messages.)