Crystal Shade Species in The World of the Guardian Dragon | World Anvil

Crystal Shade

This mostrosity is often regarded as a creation of either an ambitious mage, a demigod, or even a god. Whatever created this creature then released it into the world, where it now feasts on those that use magic.
  It is often drawn to locations where the flow of magic is extremely strong, and there it stays until the stream has dried up, after which it leaves to find a new, suitable location to feed on.
  Named Crystal Shade not because it has a crystal-like being, but because it has many times in the past been drawn to the crystal in the Heart of the World, this shadow-like creature is shaped much like a human. Its limbs are long, and it rarely walks on two feet, preferring to prowl about like a beast. Upon is surface are lines like bloodvessels that glow with the magic within it. The more magic it has, the stronger the glow.
  It is known to be drawn to casters, and the more powerful the caster, the more persistantly it hunts its pray until it goes down. These kills make it stronger, adding to its already considerable sturdiness. Fighting this creature with magic is a dangerous business, one that could save one's life as well as take it: due to its magical nature, it's capable of throwing back magics hurled at it, as well as devouring it to regain lost health. At worst, it might be momentarily enthralled, causing it to attack with more bloodlust and strength.