Chemical and Physical Science are powerful weapons, especially when they are applied to putting an Atomic Bomb into a large cannon and firing it at your opponent! That's the exact logic Momo applies to her opponents, though her low accuracy compared to Id's good evade makes that a bit tougher than usual. So that's where Plan B comes in: Astronomy! By which we mean summoning a large meteor through Ragnarok to fall on her opponent. And applying some Medical Science through her healing spells, and she has all the necessary ingredients to pull off a victory!
