Dark Sun: The Scorched World of Athas
Ancient battle between the gods and primordials concluding in the 11th Kings Age. According to the Scrolls of the Sonlinor, the gods lost the war. The end of the War was the conclusion of the Green Age.
According to the research done in the library of Evan Moreau, the gods of his realm defeated the primordials in the ancient past, diminishing their influence in the world.