The Crystalith, an original creature I conceived in my sketchbook one day.
Crystaliths (a combination of the words 'crystal' and 'monolith') are crystalline creatures resembling amethyst idols that inhabit mineral-rich caverns. On the surface they are completely inanimate, instead their life forces communicating with each other through the network of amethyst veins and geodes in the cave; that is until they sense somebody trying to mine it. A bright light shines from within all crystaliths (representative of their life force surfacing in the idols) and their teeth slide apart to reveal their mouths, from which a harmful beam of light is expelled against the intruder.