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These predatory Rahi dwell in deep caves, and keep hoards of the energy crystals so abundant there. This, alongside their excellent camouflage, makes mining such crystals a risky business - not only do you run the risk of incurring one's wrath if you steal from its collection, you also have to be exceeding careful the crystal you're mining isn't actually a sleeping Crystallovenator's tooth!
Building to the 'fluorescent' theme, I decided the Crystal King's head was a good piece to start with, and for some reason a dinosaur-like body seemed suitable. So you get a rock-crystal-dinosaur-thing. Let me know what you think!