There could be the tried and true version from Oblivion. Also I think there should be a tournament you can sign up for in the arena. Maybe a greybeard could be the grand champion or the guy you fight in the finals. Also everyone for themselves battle royale melees and possibly team combat(not multiplayer just some computer controlled NPC that teams up with you for "tornado" type matches. Thoughts?
Madness? THIS IS SKYRIM!!!(kicks Orc into pit of death)