Dark Sun is a popular campaign setting for Dungeons & Dragons, known for its harsh, post-apocalyptic desert world of Athas. It features a unique blend of survival, exploration, and social challenges, including slavery, cannibalism, and the tyranny of Sorcerer-Kings. The setting is often described as grimdark and unforgiving, with a focus on the struggle for survival in a world where magic drains the very essence of life.