Crystal Cave Golem Defender

Second assignment for 3D Modelling & Texturing 2 module.
Assignment requirement: "Conceptualise a fantasy character of your choosing, then sculpt in ZBrush".
These are the "aliens" that I imagined in the society related to the previous shrine post, as you can see that their head and alien statue are similar.
1) They are animated crystal rock aliens whose DNA got mixed in with our precious gem ore mines after thousands of their meteorite aircrafts crashed into the earth.
2) The Big Bang occurred in tandem with their crash onto Earth. Their aircrafts buried so deep into the earth, combined with the catastrophic Big Bang, the aliens would enter some kind of hibernation, regeneration state.
3) They would learn to adapt with the Earth's turbulent changes from the Big Bang even in sleep, and assimilated with the earth's concentrated gases and minerals.
This would bind the aliens to Earth forever, and this forms the beginning of the deepest ore mining caverns on Earth.
3) Eras and eons would pass before humans are well equipped to discover these caverns, reawakening the presence of these crystal golems among humans.
4) Records of crystal golems are scarce, and they differ from account to account. Some societies formed symbiotic relationships with them, some sects have religiously worshipped them as deities--- moreover, human and golem settlements alike have been annihilated by each other, most likely due to some form of greed to control over the valuable resources on the human side, and the desire to protect their land from pillagers on the golem's side.