Demonbeast Jeanne was pretty difficult. Similar idea to >>3831773 but using the Rapunzel ring. Make sure to have Preraise on at all times, dung pie and evade until she's poisoned, then fairy powder and evade until she falls asleep. Once she's asleep, get double fairy wing ASAP (doing it before runs the risk of it getting wasted because of all the resurrections you have to go through) then double fairy powder. If the powder has effect at the beginning of her turn (you see the fell asleep message), don't use it on her during the rest of her turn, in order to save on powders.