Ditherra was an angel of the Golden Seven. One of her areas of expertise was combating undead. She forged magic items that were devastating to undead and created special creatures that take a particular delight in hunting them down and utterly destroying them. Some of these undead hunting creatures are gravecrawlers, rot reavers, and necrothanes.
When gods of death become lesser or high powers, they are allowed to divulge information on creating and summoning Beasts of Ditherra. Since these creatures are the nemesis of undead, they are likewise hunted by members of the Cult of Worms and groups in the Black Tide of Thasmudyan. The gods of death that can divulge summoning spells and creation magic for the Beasts of Ditherra are Hades and Kebechet.