The Two Darkling's

Many eons ago they're where two siblings born from the fire's of war from a distanced galaxy so very far from the milky way. These two are unlike the rest of their kind so much so that their own gave them up to the leader of their planet to be trained in the ways of war and blood shad. But unknown to their kind these two had become the undoing of their own world and many other worlds and now they are on earth.