Okay, so there's already an arena for WC, KT, MB, and MS, so why not DS?
The arena would be like what DS looks like, lava all around, and ruins everywhere, and the Duel circle would be in the middle of a giant Lava lake, and haves some scorch marks and cracks on it.
the Exit would have you cross a bridge over lava, and the Exit door would be either a portal, with the arena shown inside it, or a DS door.
Please post comments.
P.S. I got this idea while watching a friend in a ranked 1v1 pvp match.