Dark Sun - AD&D 2nd
Survive under the Dark Sun in AD&D 2nd!Dark Sun, a new setting released in 1991 for AD&D 2nd Edition took a radical departure form the typical fantasy setting. Set in the post-apocalyptic desert world called Atthas, DarkSun for AD&D 2e instead incorporated dark themes and subgenres like the dying earth and planetary romance. AD&D 2nd's classes have been through major changes to suit the dark fantasy setting better. Dark Sun AD&D is also without deities, and the use of magic is seen as the reason for the world's devastation. None of the monsters normally associated with AD&D 2nd was put in except some few exceptions in warped forms to suit the Dark Sun Campaign Setting.
AD&D Dark Sun was also highly influencial in regards to art direction, establishing the trend of having artwork produced by a single artist.
The Dark Sun Setting kept being very popular online and a large community has kept making new content after TSR stopped producing it themselves.