Heres an Idea.. Make PvP unlimited levels.. But beyond 10 levels.. make make the damage be lessened based on your level difference. So a really high level would only get glancing blows on a really low level. You might get a message saying, The gods intervene and lessen your attack.
So a 13 level difference would deal a lot more damage than say a 20 level difference.
Just a thought.
dumb u high level attack u exp reason????