Just guarantee that high level idiots will not be able to kill low level players, that's all.If max level is 50, so 10 levels difference between players which can attack each other is toooooooo muuuuuuuch.That must be maximum 3-5 levels difference.If mob 5 levels lower that you didn't give you experience, so 5 levels lower player than you will not give you honor too.It's very simple :)