Took my first shot at Ultimate Descended Rush a bit ago. Probably could have cleared it but I got a bit gunshy and tried to stall for too long on my last boss (Disco Hera) and eventually just got ground out. I tried to chip her down and then the plan was to delay, then gravity, then burst, so I needed to stall Ultra Gravity up on Snow White. Since I don't want it coming up accidentally her Ultra Gravity inherit has no skillups, so it took forever, and it hurt my stalling since she's one of my defensive actives normally. In retrospect that was a total waste of time though since a Sun Quan delay would have given me plenty of time and damage to just kill her from anywhere near half anyway. So I wasted a decent spawn for a last boss on a dumb, unnecessary strategy. Oh well, next time hopefully.