Isis, Nut, Bubblie, Echidna, Grape, Isis
Yeah it's mostly water so that probably helped a lot
Still I don't think it would be that hard for something like a Ronia team or w/e as long as you have like 18k-ish HP
Floor 1 is whatever
Floor 2 you basically stall for 10 turns and then kill him. He only hits for 9k/7k, and never hits for more than 14k even at low hp so if your recovery is good it should be no problem
Floor 3 just kill him. even if you take too long he only hits for 15k
Floor 4 is a bit tricky but basically get it as close to 50% HP as possible and then burst with actives. You'll have time to recharge.
Floor 5 is easy if you set up a board since he will never attack you until you touch him once just like in Athena
Floor 6 again he doesn't hit hard. just save some heart orbs until AFTER he uses pitch black dagger. No point in healing before it.
Floor 7 probably tricky but Isis does not care about her bind at all :V Again she never hits for more than 15kish even at low hp so just beat her down.
Floor 8 you get two turns to bring her to 25% and then one more turn after that. Use actives if you want.
Floor 9 tricky, but just keep in mind his attack pattern. After his preempt, do not waste any heal orbs because he's just going to gravity the next turn. then after you heal and take the next hit, you basically get 2 turns because next turn will be a gravity again. Not sure how he changes below 50% though cause I bursted him once he was at half.
Floor 10 just burst him with whatever you got. Delay, 7 star, ronia, whatever. Only thing you have to watch for is the combo shield (which is only 5 so triple row ronia still works).
Oh yeah it also helps if you bring a heartmaker even if you are a burst team because there are a lot of places you need to heal from gravities.