Favorite boss battle themes?

[Fei-Hung]

Shortiloe said:

The Guardian Theme from Darksiders 2. Excellent. Epic. Breathtaking. Just Perfect.

Goosebumps start at 0:10.

This. This over and over again. It's simply some of the best music ever composed in recent times let alone boss theme. Still can't figure out why it was left out of the soundtrack :-/