Void Dragon

Void dragons are a mysterious, and seldomly sighted, species of dragon. Not much is know of the habits and abilities of void dragons, other than that they don't seem prone to attacking on-sight. Their sheer elusiveness, and ability to disappear without a trace if one is spotted, has led to speculation that the species does not originate from the material plane, and that they might posses some kind of plane-shifting ability.
Those few that have seen a void dragon in-person say their scales look like a piece of night sky has been cut from the heavens.