Arena of the One is a location in Divinity Original Sin II.
This is WRONG dudes... Fort Joy Arena (Fort Joy) is NOT Arena of the One (Nameless Isle)...
Lost, but it said I won and I got the reward lol
Holy crap this is incredibly tough and I have a full party of level 3 with decent gear. I still can't beat it.
Me and my friend won but it said we lost in log?