Aside from the classic Breath skill + Bonfire, I'm messing around with this one just to turn him into the Great (Melee) Wall of Lukas that aims to wall enemies so my Ranged units can poke at them. (It's not going to one-round units, but I've had him tank Bold Fighter Grima with this set before, so I think it counts for something.)
I also have another build on him with Brave Lance + Death Blow + Wrath + Brash Assault, but I'm still working on getting the fodder.