Greyhawk

The year is 576 CY (Common Year). Evil is ascendant across the lands of Eastern Oerik. If something isn't done to curtail the growing threat, Eastern Oerik will fall to tyrants, evil dragons, and monstrous hordes. Heroes are needed to bring hope to the people of the Flanaess. Even if the heroes die trying, the legends of their exploits will live on!

Adventuring parties from the Free City of Greyhawk and other settlements trek across the vast wilderness of Eastern Oerik, slaying monsters and exploring dungeons to find magic items the adventurers can use to defend their homeland and take the fight to their enemies.

Evil chromatic dragons dwell in the wilds of Eastern Oerik. For years, adventurers have kept these evil dragons at bay, sometimes with the help of benevolent metallic dragons. Lately, the chromatic dragons have grown restless, their dreams invaded by the whispers of Tiamat, who is trapped in the Nine Hells. The five-headed queen of dragons believes her escape is nigh, and from the depths of her prison, she commands her kin to go forth and claim the world of Oerth for themselves. Only the greatest among them will live to become her consorts.

"Elemental Evil" is the name given to a host of destructive, extraplanar entities—demon lords, evil elemental princes, and elder gods—who ravaged the world of Oerth long ago. Many of these entities are now trapped in dungeons, with cults and monsters seeking to free and serve them. Adventurers are the only ones equipped to keep these malign entities from escaping their subterranean prisons.

North of the Free City of Greyhawk, a demigod named Iuz has reclaimed the vast tract of land he lost after being imprisoned under Castle Greyhawk by the archmage Zagig Yragerne. The newly freed Iuz aims to lay waste to the kingdoms, steadings, temples, and outposts of his rivals. To that end, Iuz's spies are searching for powerful Artifacts they can use to ensure victory, while evil creatures spawn in Iuz's homeland and threaten neighboring realms. Adventurers can thwart Iuz by keeping evil Artifacts out of his hands and defeating the vile creatures that serve him.