High honed saint cross would probably make this an easy fight but the game hasn't been kind to me with Major Holy Orbs.
Yeah, no kidding here. Agrias +30% damage RM + Saint Cross + Shout is an easy 20k a pop.
I actually ran 2x Knight with Saint Cross/Magic Lure and Banishing Strike/Draw Fire (lol) but the latter skills turned out to be pretty useless. The big thing was having Banishing Strike and Saint Cross on different people and staggering them in that order so it wouldn't always have to be a choice between the two, and more importantly the latter would always be 20k without Barriers/etc. hindering.
edit:
Yup Demonsbane has 154ATK and beats out the rest of my hilarious XII synergy. (Danjuro on St Cross guy)