close connection to the Great Old One Bugg-Shash, so should Yibb-Tstll be regarded as a Great Old One—specifically in the Drowners group introduced by Brian Lumley, parasitic alien entities which thrive by vampyrizing the Great Old Ones themselves - though in RPG materials she is classed as an "Outer God". Yidhra Yidhra (The Dream Witch or Yee-Tho-Rah) usually appears as a youthful, attractive, earthly female, though her shape may vary. Yidhra has been on Earth since the first microorganisms appeared and is immortal. To survive in a changing environment, she gained the ability to take on the characteristics of any creature that she devoured. Over time, Yidhra split herself into different aspects, though each part shares her consciousness. Yidhra is served by devoted cults found in such widely separated places as Myanmar, Chad, Laos, Sumer, New Mexico, and Texas. Members of Yidhra's cult can gain immortality by merging with her, though they become somewhat like Yidhra as a consequence. Those who serve her are also promised plentiful harvests and healthy livestock. She usually conceals her true form behind a powerful illusion, appearing as a comely young woman; only favored members of her cult can see her as she actually is. Yomagn'tho Yomagn'tho (The Feaster from the Stars, That Which Relentlessly Waits Outside) is a malevolent being who wishes nothing more than the destruction of humanity for unknown reasons. He waits in his home dimension in Pherkard, until he is summoned to Earth. When first summoned, Yomagn'tho appears as a small ball of fire that quickly expands to a large circle of fire with three flaming inner petals. The reptilian burrowing folk, the Rhygntu, are known to worship this malignant deity. Elder Gods In post-Lovecraft stories, the Elder Gods oppose the likes of Cthulhu. Derleth attempted to retroactively group the benevolent deity Nodens in this category (who acts as deus ex machina for the protagonists in both The Dream-Quest of Unknown Kadath and "The Strange High House in the Mist"). Joseph S. Pulver mentions in his Nightmare's Disciple (2006) a set of original Elder Gods, but offers no descriptions of their true forms. The story introduces entities as Adaedu, Alithlai-Tyy, Dveahtehs, Eyroix, Ovytonv, Urthuvn, Xislanyx and Xuthyos-Sihb’Bz. Others have a cult title as Othkkartho (Sire of the Four Titans of Balance and Order), which is said to be Nodens's son, and Zehirete, who is The Pure and Holy Womb of Light.