Is your feature request related to a problem? Please describe.
Similar to stealing money, have the ability to steal a percentage of a players XP on killing them.

@TomLewis This is pretty old now but I kept it around because I was considering adding it.
Is this still a feature you would use?

I completely forgot about this! 3 years ago!
I would definitely love to give it a try, it's an additional small reward when killing a player, encourages a bit more aggression!

Not sure how it would work if someone was trapped and being killed over and over, if there needs to be a cap after x time.

Also not sure if it should be a percentage or specific amount of their levels/xp.

I just love the idea that it's vanilla and wouldn't require economy system, plus they can easily regain XP from just playing, more balanced than money!