since the idea of PKing is disliked around here, could there be something like, you attack the person and you knock them out, but you cant kill them, that way for the people who like to be thieves have something to do, they knock you out and then pick pocket you and run off without being seen, however if they pick the wrong person, and that person is much stronger they cant be knocked out ,but the thief themselves can be knocked out and the person they attacked can steal from them.... and also there can be like a thing were people get tired of this certain theif, and they group together to find him, then, when they do, they knock him out, tie him up, and drag him into the arena where justice will be served on him by those who hes stolen from.... or if theyre quick enough about it, maybe noone will ever know who it was that just knocked them out and stole their stuff, of course certain items can be resticted from being stolen determined by the theifs lvl and the value of the item....