I was checking out sounds in Kontakt and came across one called "Future World" that gave me an idea for an industrial type boss battle; nothing fancy, just intense and metaphorical of a challenging fight.

It took a while to get a bass sound that I liked; ultimately, I chose one from Synergy X called "Face Fuka". The softer "catch your breath" moments ended up sounding somewhat similar to early Metroid with sounds from Omnisphere.

Combined in Cubase 5.