Aphoom-Zhah, called The Cold Flame, is a Great Old One that debuted in Lin Carter's short story "The Acolyte of the Flame" (1985);although the being was first mentioned in an earlier tale by Carter, "The Horror in the Gallery" (1976). Aphoom-Zhah is also mentioned in Carter's "The Light from the Pole" (1980), a story Carter wrote from an early draft by Clark Ashton Smith. Smith later developed this draft into "The Coming of the White Worm" (1941).
Aphoom-Zhah is the progeny of Cthugha and is worshipped as the Lord of the Pole because he is trapped, like Ithaqua, above the Arctic Circle. Aphoom-Zhah frequently visited Hyperborea during the last ice age. His legend is chronicled in the Pnakotic Manuscripts.
Aphoom-Zhah appears as a vast, cold, grey flame that freezes whatever it touches. The being came to Earth from the star Fomalhaut, briefly visiting the planet Yaksh (Neptune) before taking up residence in Mount Yarak, a legendary mountain atop the North Pole. When the Elder Gods tried to imprison him beneath the pole, Aphoom-Zhah erupted with such fury that he froze the lands around him. Aphoom-Zhah is believed to be responsible for the glaciation that eventually overwhelmed Hyperborea, Zobna, and Lomar.
Aphoom-Zhah likely spawned Gnoph-Keh, Rhan-Tegoth, and Voorm. Though no human cult worships this being, Aphoom-Zhah is revered by the gnophkeh, the Voormi and his own race of minions; the spectral Ylidheem.