Well i guess an army of healers even wont do it at that matter. I mean if you place black iris all ranged slots, they can barely heal 5k hp with halved atk no?

Btw i placed leanne in front of prince after retreating sophie there and she could hold the boss. Sophie already halved the boss hp thus made up with leannes poor attack. Anyway i can go back to niel farming as i 3* all maps, already did that map 2 times ended up with 2 niel 2 plat spirits O.o guess i wont be this lucky from now on