[Suzerain of Sheol]

Yeah, in FE10, whenever the Black Knight shows up in battle, I always unequip Alondite from him and let him lead the assault, then watch in glee as every enemy on the map scrambles to assault him for 0 damage each hit. :p

And I will note, for all the awful, awful units you get in FE10, the game makes up for it in the endgame by giving you all 5 of the beast kings and 3 dragons, just in case you managed to barely scrape your way through the rest of the game. All of them together are easily capable of steam-rolling the final battles. I've never used them, though, since my team is almost always godly in their own right.