There hasn't been any new ultra dungeons in forever, and I really think there should be more of them, considering how neat they were! Lord Nightshade, Jade Oni, Astraeus Mithraya & Ptolemos are the most obvious picks for refights. The Jade Oni duel could be against all of the onis thinking about it. Either way, theres a load of potential for ultra duels and I really hope for them to be brought back.
