The Dyvanakh Dynasty is a Necron Dynasty which has only recently fully awoken. Originally awakening from the Great Sleep in early M41 from their Crownworld of Trakonn, the Necrons of the Dyvanakh Dynasty were unable to shake off their hibernation-induced disorientation for nearly five centuries and this made them vulnerable to an assault by a nearby Forge World of the Imperium.
Eventually, the Dyvanakh were able to repel the human siege and drive the Imperial forces from their world. Since then, they have been attempting to search for other lost Tomb Worlds of their Dynasty. Thus far they have been unable to make contact with any, as the missing Dyvanakh worlds were engulfed and destroyed by a Warp Storm thousands of years ago.