The historical record of Mog Creoch contains little in the way of a lot of direct actions on its part. It is mostly a record of its followers and sects.
Information Sources: Mundane Reference | Associated Phenomenology Only | Specific Lore
Much like Djerduth, it is venerated as a death “god”, personifying all aspects of death, with purpose.
The unreasoning worm Mog Creoch is much easier to trade for power, and the “followers” of it are rarely more than those seeking personal power from a source that generally could care less the type of individual that serves them, as long as the outcome is headless bodies, sundered corpses, spilled blood, the smell of rotting flesh and food for worms. These things are pleasing to it.
This fact is only known by the druids of the land, and only realized after a long period of thought, study, and melding with the land. Though all work to defeat the evil lords in the north, the druids seek reconciliation – they have no wish to see the spirit loose all its power with the casting down of the winter host. Death run amok, random and without reason would be a nightmare worse than the host itself. Or, death unknown to the living in which the natural cycle is broken in favor of life only.