Riftwatch is a campaign setting for TTRPGs. In it, a series of worlds clash together, experiencing one another through the disorder of the Rifts. Whether it is invasion of the Humans of Dunya into Arlir, the Yu-Slang's war with the Orvert spilling into other worlds, the mischievous Satyrs of Gi employing shenanigans in Darady, or the Goblins of Midiri expanding everywhere, the Rifts bring the races of Riftwatch, collectively called the Quick, into conflict.
All the familiar species and roles of the D&D experience can be found in Riftwatch, for easy system translation. Their histories and aesthetic are different from the standards in the Forgotten Realms, and many names have been altered, though the traditional nomenclature may still be used. Elves are the Erli, Dwarves the Dvardi, Gnomes are the Noli, etc. The structure of the planes is different, but not wholly alien to previous concepts.
This setting is meant to shake things up a little, and give players looking for something different than the vanilla D&D experience a new sandbox to play in.