It is believed that the Shevar came from another universe with different physical laws. They experimented with their arcane arts until they opened a way into this universe, and the pathway they opened led to a planet teeming with life. This was an unimagined bounty to the Shevar and many of them came across to settle the world they found. They utterly devastated this world, destroying all other life on the planet by feeding on its life force. They aren't purposely hostile or evil, but their values are incomprehensible and they do not recognize the creatures of this universe as living beings.