Its whole body is covered with dark crystals that act as armor imbued with dark power. It can locate gems with a special vision, smash anything to get them with its claws, and eat them to power the dark crystals.
The gems on its body grew to cover its body. When night falls, it can absorb moonlight through the crystals to illuminate its path.
Its eyes have developed a special vision to locate gems within rocks, then it smashes the rocks with its claws to get them out.