Short answers, pulled from the story.
Mythic Odysseys of Theros is a 256-page sourcebook for the 5th edition of Dungeons and Dragons, released in 2020. It adapts the Theros campaign setting from Magic: The Gathering for tabletop role-playing, drawing on Greek mythology and featuring a pantheon of gods who play an active role in the game.
The hardcover edition was delayed to the 21st of July 2020 due to COVID-19 pandemic printing disruptions, pushed back from its original date of the 2nd of June 2020. Digital editions remained available through D&D Beyond, Fantasy Grounds, and Roll20.
James Wyatt and F. Wesley Schneider were the lead designers. Wyatt had worked on Dungeons and Dragons for more than a decade before moving to Magic: The Gathering in 2014, and had previously written the Plane Shift PDF series adapting Magic planes for D&D.
The sourcebook introduces two new character races, the satyr and the Leonin, along with three reprinted races: the centaur, minotaur, and Triton. New subclasses include the College of Eloquence Bard and the Oath of Glory Paladin.
By the week ending the 25th of July 2020, the book had sold 14,028 units and ranked seventh on Publishers Weekly's bestseller list for hardcover nonfiction.
Critical response was divided. Gavin Sheehan of Bleeding Cool called it "a throwaway book made simply to rehook MTG players after Ravnica," while Riley Silverman of Nerdist described it as "a vibrant and exciting setting that is definitely worth a look" and noted that players need no prior knowledge of Magic or Greek mythology to enjoy it.