Crystal Elementals

Crystal Elementals are made of pure crystal, being capable of both extremely powerful offensive attacks, and extremely durable defensive maneuvers, these guys are incredibly powerful and pretty darn intelligent to boot. They usually reside in one place, and can seem completely human in appearance aside from a small gem on their body somewhere, usually their forehead. They are usually the only Elementals allowed to integrate into Human society, due to their ability to pass themselves off as Human. A contributing factor to this is the fact that they're usually the only kind who try to. Their homes are usually made of nothing but crystals and shards, but if they live with Humans, only their basement or a secret area in their abode is like this. The rest of the house in normal. They don't age, but they can still be killed, although they've been rumored to live for millennia if undisturbed and in their natural crystal homes.