Haven't seen one of these threads yet and there is no time like the present. I'll start with the Belseraph arena. It appears to currently work something like 50% chance to kill the unit, if not gain 1-5 xp. Regardless get 1 for 3 turns. I think it would be better with something like: 5% outright dead 5% lose 3 xp 20% lose 2 xp 20% lose 1 xp 20% gain 1 xp 15% gain 2 xp 10% gain 3 xp 5% gain 4 xp Units that would end with negative experience die.