A big part of lore and gameplay involves the races that make up the cultures and nations that serve as a backdrop for most adventures. There's a lot to choose from when it comes to building a D&D game, settings, or character, and the tradition continues with 5e expansions. It can mean rulebooks, supplemental materials, or campaign and adventuring guides. An expansion in the Dungeons & Dragonsuniverse can mean a lot of different things.
