You Say Run - an easy answer, maybe, but it's easy because it's obvious :P

For The Glory, by All Good Things - pretty great for a Dawn Caste. Especially if you can make them a gladiator.

Basically anything by Sabaton - 40:1, Resist and Bite, The Last Stand, Coat of Arms...

If you're looking for something less bombastic, "The Devil's Got you Beat by Blue Sacramento" is pretty cool for a Solar from the south.

I only recently heard this one, but Nevermore from RWBY is pretty great (most of RWBY's music is great rock. Even if the show itself...