Aggravate is good, getting a kishin in there is also good (I think that's w hat they are called, first one I got was a stone-golem looking dude). I opted for a healer instead but the boss doesn't really fight well, so it wasn't really needed, just rely on other groups to heal you if you must.
I couldn't kill him before he rezzed all the enemies again, and I had to re-kill a few, but it still didn't seem to bad.
My beef with the game is that whenever an enemy can cast a spell that one of my units is weak against, it seems like I ALWAYS get stunned, frozen, whatever. Yet if I ever get to cast mabufu on 3 frost weak enemies, chances are not one of them gets frozen. argh