Golem

Golems are a sentient silicon-based species native to the planet Phlegethon

Appearance
Golems are a large, vaguely humanoid aliens with a bodies made up of incredibly durable crystal-like structures. Unlike most forms of life that are carbon-based, Golems are silicon-based.

History
Nitro discovered the Golems, and after witnessing the power of several individuals, he recruited them into his empire. Due to the inhabitability of the Golems' home planet Phlegethon, Nitro never established a permanent outpost on its surface.