Dungeons & Dragons made good use of the concept of a multiverse before it became so obnoxious in entertainment. Every game of D&D can take place in a different world; many Dungeon Masters have fun creating their own, but for those who lack the time or inclination, there are plenty of settings to choose from. Ed Greenwood’s Forgotten Realms and Gary Gygax’s Greyhawk are usually considered the “classic” D&D settings, as they deliver on that flavor of fantasy that players expect from the game. But there are also more unusual choices that take D&D’s high fantasy premise in a whole different direction.