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Reveal the truth about the great conflicts of the D&D multiverse in this supplement for the world's greatest roleplaying game.

Discover a tome full of research from the legendary mage Mordenkainen as he explores the multiverse and sheds light on dozens of new monsters and creatures from new planes of existence. This Sourcebook helps any dungeon master understand the history of races, devils, demons, and more to help run any creature for their game.

• Adds 1 new race, the cosmic warring Gith, and 11 new subraces for use in the guided Character Builder

• Unlock 120 deadly new monsters to use in the Encounter Builder to create & run organized battles for your party

• Get new magic items and see their unique powers with just a click on your character sheet

This purchase unlocks the contents of this source for use with D&D Beyond, including the book in digital format in the game compendium and access to all of the book's options in the searchable listings, character builder, and digital sheet.