it actually requires serious luck and skill. I’d recommend saving just before the fight. You have to be very wary of your energy points AND focus on healing your characters when possible. But it really takes strategy. Luck does play a part but they can be beaten. I managed to. WASNT easy mind you. But it is possible. I guess I could give basic tips if it’s allowed without fully spoiling how. As someone stated before guarding is very helpful. You also need to pay attention to the spore attack. You get one free move before it erupts. So heal the character with the lowest health and make sure to guard the turn. You can attack after it explodes.