King's Judgment (aka KJ) can be performed by any Nation leader of at least level 100, whose guild is a member of a nation of at least nation level five. King's Judgement is simply the power to "PK" anyone you want that is not in a safe zone such as a town. However this game isn't truly an open PK game. See PK for more information. The victor of combat either the person performing the King's Judgement or the victim can win a random piece of equipment from the loser if they do not have Vial of Protection Active.