I saw this posted somewhere else and wondered as well, could Mother and Pennywise be the same or related entities?
They are both otherworldly creatures with spider-like bodies and immense powers, who ultimately seem to feed on fear and agony--if not other, worse things on the other side.
It also seems we are in the same world as IT, as Dorrance Marstellar is mentioned, and he later on plays a significant role in Insomnia as a resident of Derry.
It also seems we are in the same world as IT, as Dorrance Marstellar is mentioned, and he later on plays a significant role in Insomnia as a resident of Derry.