The Macrocosm is a hypothetical Plane in which the Chososion is thought to primarily dwell.
Source: Planescape Monstrous Compendium Appendix III
I am none other than Maricullus the Great Leader of Mephits, 3rd wonder of the universe, Slayer of Slaads, bringer of doom, most honorable consular of the planes...
— An Ice Mephit losing his crowd
