The world Dathomir holds many dark secrets -- such as ancient incantations that could raise the dead. When the planet was attacked by the Separatists during the Clone Wars, the most ancient and knowledgeable of the Nightsister clan used her power to stir the bodies of the Nightsisters graveyard. From preserved cocoons built to resemble the trees of Dathomir emerged mummified warriors. The shrieking zombies mindlessly attacked their enemies, swarming over battle droids in droves.