Domains: Motherhood, childbirth, the maternal line.
Era of ascension: Golden Age of Man (~180,000 years ago) — among the earliest of the Golden Age daemons. Cohort: dead. Died: God War & Long Winter (~75,000 years ago), when Long-Winter infant mortality became universal and the household rite she required — the safe-birth thanks — had no occasions left to perform.
Worshipped by: The birth-attendants of the Golden Age, the matrilineal traditions across cultures, and the household fertility cults practiced at the threshold of the women's chambers rather than at any public shrine. No living culture maintains her worship. (The worships edge is authored downstream on the worshipper, not here.)
Yelláreth's cult predates urbanism. She is older than the Golden Age cities, older than written record, older than any of the warrior-gods whose theologies the God War later wrecked. Her worship was domestic and concrete: a small offering in the birth-chamber, a name spoken at the cutting of the cord, a thanks given when the mother stood up well and the child cried. The rite was the thanks, not the asking — her doctrine held that a safe birth was a gift recognized after the fact, not a favour begged in advance.
The Winter ended her cult by ending the occasions. Cold and famine collapsed pregnancies in the early months; what was carried to term arrived too small to nurse; mothers died with infants in the same week and the thanks-rite had no one to perform it. Sulvath's domain of desire emptied into hers and out the other side into nothing — love produced no children, no children produced no thanks, no thanks produced no goddess. She is recorded in the earliest pantheon lists from cultures that had no shared language; her end is recorded nowhere, because the people who would have recorded it died with her.
Distinct from Sulvath (desire and the act before the cradle) and from Aedorath (the fertility of cultivated land), her domain was specifically the human birth and what it cost the mother.