Domains: Drunkenness, feast, ecstatic communion.
Era of ascension: Golden Age of Man (~150,000 years ago). Cohort: dead. Died: God War & Long Winter (~75,000 years ago), when the harvest failed two years running, the wine-presses fell idle, and the feasts stopped being held.
Worshipped by: Festival traditions of the Golden Age, the vintner guilds of the great wine-growing river valleys, and the ecstatic cults whose rite was to drink past the point of useful speech and then be cared for through the dawn. No living culture maintains his worship. (The worships edge is authored downstream on the worshipper, not here.)
Bevvon was the god of what was done with surplus grain. His domain was not the planting and not the harvest — those were Aedorath's — but the moment after, when more had been brought in than was needed to live, and the question was what to do with the excess. The festival cults answered: ferment it, drink it together, lose the self in the doing, return in the morning, repeat at the next solstice. His priesthoods kept the calendars of the wine-press cities, ran the great public feasts at planting and at the end of harvest, and were known across the Golden Age polities as the least dignified and best-attended of the ceremonial classes.
He was a surplus god, in every sense. When the harvest failed and there was no more than the bare ration to go around, the rite that defined his worship — the feast of the surplus, drunk together — became literally impossible. His cult emptied in two years. The vintner-guilds tried to bridge with the cellared stores, and held longer than most cults, until the cellars too were eaten by hungry survivors who no longer remembered what the stored amphorae had been kept for. His name was already a joke by the time the cold finished the rest.