Domains: Failed sacrifice, the broken altar, theology that didn't take.
Era of ascension: Age of Craggus (~38,000 years ago) — among the later of the Craggus-era daemons, ascending only after the foundational cults of the rebuild were already established. Cohort: dead. Died: Lost Ages (~30,000 years ago), when the Laughing Plague tipped over a cult that had always been thin and would in any case never have consolidated.
Worshipped by: The cults at the margins of the Craggus-era pantheon — the small specialist orders whose rites were never widely adopted, the village shrines whose deities never named themselves, the failed missions of the larger cults into regions that did not take to them. Krakkek was the god of all of them at once, taken collectively as a category. No living culture maintains his worship. (The worships edge is authored downstream on the worshipper, not here.)
Krakkek was meta-religious in the most uncomfortable way the Craggus era admitted. His doctrine acknowledged what every other cult avoided saying directly: not every theology survives the moment of its founding, most do not, and the failed cult is itself a religious phenomenon worth marking. His shrines were built at the sites of dissolved cults, on broken altars that had been raised to other gods and abandoned. His rite was simple — the recognition itself was the rite — and his priesthoods were a few dozen scattered figures who walked between dead shrines and noted what had been there.
He was always thin. The cult never consolidated because consolidating was conceptually at odds with what he was for: a successful Krakkek cult would have been a contradiction, and the priesthoods were openly aware of this. The doctrine treated his eventual disappearance as expected and almost desirable. He existed to mark the failed; when the era's marking was done, he would go.
The Plague tipped him over almost incidentally. A cult that had been small and was deliberately not expanding had no demographic reserve to draw on when its priests began to die; within a generation he had no functioning priesthood at all, and the broken altars his rite had cataloged went uncataloged after. His existence had foreshadowed the Plague's wholesale faith-collapse from inside the Craggus pantheon — he had been the in-house theological recognition that this kind of thing happened, and the Plague proved his doctrine right at the scale that included him. He is distinct from Dyos of the previous age, whose sacrifice was the most successful single act in pantheon history; Krakkek was every sacrifice that had been refused by its own god.