This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. Idh-yaa,The Mighty Mother, is a deity in the Cthulhu Mythos, who gave birth to the Star-Spawn of Cthulhu on a planet in the Xoth Star system, after mating with Cthulhu. She specifically produced the sons of Cthulhu: Ghatanothoa, Ythogtha, and Zoth-Ommog; and a daughter of Cthulhu: Cthylla. Also once called Quum-yaa.

Idh-yaa was created by Lin Carter.

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