Mordenkainen's Tome of Foes is a sourcebook for the 5th edition of the Dungeons & Dragons fantasy role-playing game, published in 2018. It is, in part, a supplement to the 5th edition Monster Manual and the Players Handbook. Contents This book adds a variety of new playable races and expands on existing creatures in the Monster Manual in addition to adding many new ones. The book also contains marginalia by Mordenkainen, a wizard originally created by Gary Gygax for his World of Greyhawk campaign. Chapter 1: The Blood War 8 new Tiefling subraces Lords of the Nine and other devil lore Princes of the Abyss and other demon lore Fiendish history, cults and more Chapter 2: Elves 3 new Elf subraces including the return of the Eladrin and Shadar-kai Elven history, religion, outlook and more Chapter 3: Dwarves and Duergar Duergar racial traits History of the Dwarf/Duergar war, relations with dragons and more Chapter 4: Gith and Their Endless War Githyanki and Githzerai racial traits Wars, history, culture and more Chapter 5: Halflings and Gnomes Deep Gnome racial traits Halfling lifestyle, mythology and more Gnome locales, gods and more Chapter 6: Bestiary 140 new monsters complete with game statistics and lore including the Astral dreadnought, Gray render, and Tortle Appendix: Monster Lists Publication history In February 2018, Mordenkainen's Tome of Foes was announced. From May 7, 2018 to May 18, 2018, Wizards of the Coast released two podcasts a day to support the launch. An exclusive edition with alternate cover art by Vance Kelly was released early to select game shops on May 18, 2018. The book was published on May 29, 2018. The book was also released as a digital product through the following Wizards of the Coast licensees: D&D Beyond, Fantasy Grounds, and Roll20. The Oblex, one of the monsters in this book, was conceived by Make-A-Wish recipient Nolan Whale during his day at Wizards of the Coast. SyFy Wire in 2018 called it one of "The 9 Scariest, Most Unforgettable Monsters From Dungeons & Dragons", saying that "Eaten by an ooze that can then use your memory and form to trick and lure others in? That’s the stuff of horrors — and the stuff of an epic adventure. If you weren't paranoid about other characters before, you should be now!" D&D Beyond delisting The digital edition on D&D Beyond is scheduled to be delisted on May 17,