Открываете l2pcinstance и импорт:
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import net.sf.l2j.gameserver.Announcements;
Находите эти строки и добавляете код:
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// Add karma to attacker and increase its PK counter
setPkKills(getPkKills() + 1);
setKarma(getKarma() + newKarma);
Сам код:
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// Delvl Player When they PK Another Player
getStat().removeExpAndSp((getExp() - Experience.LEVEL[getStat().getLevel() - 1]), 0);
broadcastKarma();
Announcements.getInstance().announceToAll("" + this.getName()+ " Has been Delvld for PKing!");
sendMessage("You Have Been Delvld for Wrong Actions! You are now level " +getLevel()+ " !");
Пример работы: