[Chris_Byler]

I've done Earthpower, Ironskin/Invulnerability, attack one turn, Flame Eruption x2, (nothing) with Dai Oni before and it worked pretty well. The one turn of attack gets you in range for FE and the reinvig from Earthpower keeps you going in melee after that. (Additional reinvig from items still helps, though. If you're skilled enough in Death and have the research you may want to add Soul Vortex to the buff list.)

A few gems are helpful so you don't go into battle fatigued.