Dammit!!
Here's my character list:
I have four magic users who don't have flare or ultima. They all have Walls. I equipped one with maduin, but that's only for one shot, then I can't use it anymore. I tried to phantom my people and berserk MagiMaster, but since I don't have non-elemental magic, it's a pain in the ass to do any damage to him. I also just tried waiting around while he cast elemental magic against my walled characters, sometimes he would do 9999 damage to himself, but twice now when I think he's almost dead, he casts something I don't know what and all my people die.