-|script|powerup-lifedrain|32767
{
    end;

OnCast:
    if(call("boss_powerup_checks")) end;
    if (getmapflag(getmap(), MF_TOWN)) goto L_Fail_town;
    set @_M_BLOCK, 1; // block casting, until the timer clears it
    addtimer 30000, "Magic Timer::OnClear"; // set the new debuff
    sc_start SC_COOLDOWN, 30000, 0, BL_ID;
    misceffect FX_PENTAGRAM_BURST, strcharinfo(0);
    set @dist, 12;
    foreach 0, getmap(), (POS_X - @dist), (POS_Y - @dist), (POS_X + @dist), (POS_Y + @dist), strnpcinfo(0) + "::OnHit";
    end;

OnHit:
    if (@target_id == BL_ID) end;               // Do not drain caster
    set @targethp, get(Hp, @target_id);         // Get HP of victim
    if (@targethp > 0) goto L_cont;
    set @targethp, 0;
    end;                                        // Do not drain dead!
L_cont:
    set @hpgain, min((@targethp / 4), 500);        // Boss could be beefy -> clamp
    message strcharinfo(0, @target_id), "[boss-lifedrain] : "+strcharinfo(0, BL_ID)+" drains "+(@hpgain * 2)+" hitpoints!";
    misceffect FX_CHANNELLING_RAISE, strcharinfo(0, @target_id);
    set Hp, (@targethp - (2 * @hpgain)), @target_id; // Drain victim
    set @targethp, (get(Hp, BL_ID) + @hpgain);     // Compute caster's HP + bonus 
    set Hp, (@targethp), BL_ID;                    // Heal caster by half drain
    set @hpgain, 0;
    set @targethp, 0;
    end;

L_Fail_town:
    message strcharinfo(0), "[boss-lifedrain] : aura of this place doesn't lets you to drain life!";
    end;

OnInit:
    set .school, SKILL_MAGIC;
    set .invocation$, chr(MAGIC_SYMBOL) + "maplifedrain"; // used in npcs that refer to this spell
    void call("magic_register", "OnCast");
    set .level, 0;
    set .exp_gain, 0;
    end;
}