Domains: Cold, winter, the still killing.
Era of ascension: Golden Age of Man (~140,000 years ago). Cohort: dead. Died: God War & Long Winter (~75,000 years ago), when the early-Winter cold she had been the quiet warning of stopped being seasonal and ate her along with everything she had presided over.
Worshipped by: Golden-Age polar polities and high-altitude winter-priesthoods — communities for whom the cold season was always survival rather than discomfort. No living culture maintains her worship. (The worships edge is authored downstream on the worshipper, not here.)
Vyrréth was the pantheon's quiet ironist. Her domain was not the storm and not the snow — both belonged to other gods — but the still, killing cold of the hour after the wind had dropped, when a traveller sat down in a drift to rest and did not get up. Her shrines were always cold: open-roofed, swept clean, never warmed. The winter-priests who tended them prepared for survival in her presence as a religious act, on the principle that what she demanded of the world she would not be flattered into withholding.
When the cold deepened in the first decades of the God War, the priesthoods believed themselves elevated. The shrines filled. Travelling cults from temperate regions sought instruction in the cold-rites. Then the cold kept deepening past anything the texts described, and kept deepening, and her priests grasped too late what they had mistaken: this was not the goddess walking, it was the goddess being eaten by the thing she had carefully kept her distance from. Her last congregations froze inside her open-roofed shrines, where, by the theology of the cult, they had always belonged.
She is distinct from Drevun, whose endurance is against the stone; and from Ornath, who is the storm overhead. Vyrréth was the cold that needed no storm to arrive.