Some predefined group of monster and levels:
Each time you won in the arena the next level will be harder and harder.
It will function like a quest:
You speak to a npc that say you your level and you can try or not at the end bonus XP and gold, It can be another way to make this game more competitive with other player because compare our stats is not truly significative.
I will try to make it with the creation tool but say me if you think that is a good idea or not. Thanks you.
Also if you know a good place for the arena because I haven't