Mythic Odysseys of Theros is a sourcebook that details the Theros campaign setting for the 5th edition of the Dungeons & Dragons fantasy role-playing game published in June 2020. The plane was originally created for the Magic: The Gathering collectible card game and first appeared in the card set Theros, which was released in September 2013. It is inspired by Greek mythology and has a powerful pantheon of Gods that are present and active in both the world and the lives of the player characters. Contents Mythic Odysseys of Theros is a 256-page campaign and adventure guide for using the Theros setting, from the collectible card game Magic: The Gathering, in the 5th edition. The book expands on game elements for the 5th edition, such as: Two new races — satyr and Leonin (a feline race from Magic: the Gathering) Three reprinted races — centaur, minotaur (from Guildmasters' Guide to Ravnica), and Triton (an updated version from Volo’s Guide to Monsters) Two subclass options — the College of Eloquence Bard and the Oath of Glory Paladin New mechanics — an expanded Piety system (from the Dungeon Master's Guide), an omen chart, and a new supernatural gift ability that is chosen during character creation An expanded bestiary that includes new Mythic level monsters Theros themed magic items and artifacts Publication history Starting in 2016, James Wyatt, a "longtime Wizards employee who worked on D&D for over a decade before moving over to Magic in 2014", began to write a series of free PDF releases called Plane Shift where various Magic: The Gathering planes were adapted for Dungeons & Dragons. The positive response to the "Plane Shift" articles lead to the publication of Guildmasters' Guide to Ravnica (2018), the first full hardcover Dungeons & Dragons guide to the Magic setting, and the success of that sourcebook lead to the publication of Mythic Odysseys of Theros. Wyatt and F. Wesley Schneider were the lead designers on the book. The new sourcebook was announced on March 2, 2020 after being leaked through an Amazon product listing. While the book was originally scheduled for release on June 2, 2020, printing delays due to the COVID-19 pandemic meant that the hardcover release was delayed to July 21, 2020. An alternate art cover of the book was released as a local game store exclusive. The book is also available as a digital product through the following Wizards