Mythburrow

 is the cavernous lair of Gelidon, the Nightmare in Ivory, found in the eastern Flotket Alps.

Fauna
A group of yetis inhabit the cavern in an apparently symbiotic relationship with Gelidon, bringing her offerings of food left at the base of the shaft leading upward to her lair. They camp in the cavern just inside the entrance, while Gelidon's lair lies deeper inside the cavernous complex.