The Chained World
The Unknown, also named the Lord of the Flies, Insect King and the Many Legged One, is a Demon Lord. It was infamous for leading the demon armies that razed much of Ur during the Demon Wars.
At the end of the Demon Wars it was banished back to the Abyss, but fragments of its conciousness remained behind, ever seeking foolish mortals to corrupt.
One such mortal was Rostovok Rubytooth, a dwarf who entered into a pact with the Insect King following a disastrous battle.
Recently a ritual was completed in Trums’fragh with the unwitting aid of a party of adventurers, Rostovok included, which released the Demon Lord’s essence back into the world. There is no telling what horrors the creature will unleash.