This Campaign Setting has evolved over 20 years of utilization in every edition of D&D from 1st Ed up through Pathfinder (no 4th Ed). It’s current Incarnation is as a Pathfinder Campaign Setting, and all information contained herein is under that assumption.
Chornalth is one Campaign World, that is many – three in fact. It is the culmination of more than 20 years of gaming, with a shared campaign world managed by three separate GM’s. While each of the Three Worlds of Chornalth is unique (each having been originally based on one of the three major TSR Campaign Settings (Forgotten Realms, Greyhawk, and Krynn), they still retain a unification between them that has grown out of the numerous campaigns which have been run in the setting.
Each of the Three Worlds is highly customized by it’s respective GM. Pieces of the Standard worlds have been removed while other pieces have been shoehorned in. Multiple campaigns run in The Three Worlds have changed the very face of each, with every party of adventurers leaving their mark on the future of the Three Worlds.