Arcana Unleashed expands Dungeons & Dragons with a wealth of new options centered around arcane power: 8 new and revised subclasses, 33 new and revised spells, 19 magical creatures, 10 backgrounds, and more than 20 feats, all deeply rooted in arcane factions and magical traditions. Nine arcane factions and six group patrons provide Dungeon Masters with powerful tools for politics, intrigue, and power plays within a high-magic society, while 47 magic items—including evolving relics and legendary artifacts—enable long-term progression and recognizable signature items. The book also includes "Tomb of the Shadow Serpents," a level 1 introductory adventure designed for one or two play sessions, ideal for immediate use in the game.