Further information: Mystara
A campaign setting that evolved from the B and X series modules. Unlike other settings, "The Known World" had ascended immortal beings instead of gods. Mystara was the "default" setting for the non-Advanced editions of D&D, and the Blackmoor setting was later retconned to exist in Mystara's distant past. This campaign setting is no longer officially supported.
Read more about this topic: Dungeons & Dragons Campaign Settings