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The PK system is reminicent of UO's fame system. Where you have murder counts, innocents, murderers, flagging grey, etc. It's the best way to have nonconsenual PvP imho.
All oldschool UOers should look forward to this game. The only thing it doesn't have that UO had was a cool combat system. Although, I haven't played RoT yet so I might be wrong.