Megadungeon cult

In the megadungeon there is a cult that considers the megadungeon and its myriad connections to be part of a dream, not unlike the dream of Azathoth.  They fear that if the dreamer wakes up then the world will be destroyed, so at all costs they seek to keep the connections to the sites of the world active and build new ones to give the dreamer more material for their dream.

In fact, I could probably pretty much call the being they worship “The Dreamer” and steal the story of Azathoth…