Bracken are Necrons?
Ancient race, seen the coming and going of stars and civilization Burried underground to hide from a great war and recuperate from it Though many are damaged and broken, countless more remain Awaken in stages, with warriors awakening first to guard the rest as they awaken Practically immortal Super durable Hard, angular creature with a hatred for soft, fleshy things Try to take back their old things Basically incomprehensible for mortals
Originally weak fleshy thing with short lifespan that become very hard and immortal when it bonds with a certain hardy material. Crystal = Necrodermis