God of Magma

This unicorn is arguably a pure energy being. Their core is made of molten metals, which seep through gaps in their rock-like skin shell as a magma mane and tail. As this magma pools and reaches the ground it cools into solid rocks. Sections of their shell are thin, allowing their bones suspended in the glowing liquid to be visible from the outside. With age, more and more cracks appear and heal across their skin