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Proceeds from this monster supplement support the charity Extra Life

Crawling from the darkest recesses of D&D's history comes a ferocious menagerie of monsters, malevolent and benign! These 17 creatures first appeared in the Fiend Folio for first edition AD&D. Now, thanks to your support of Extra Life, they enter the world of fifth edition D&D.

• Unlocks 17 fierce creatures to use in the Encounter Builder to create & run organized battles for your party
• Detailed stat blocks and descriptions to use the monsters in your game

Discover the other books benefiting Extra Life:
Infernal Machine Rebuild
One Grung Above
Locathah Rising
The Tortle Package
Lost Laboratory of Kwalish

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 options from the book in the searchable listings, character builder, and digital sheet.

Extra Life supports Children's Miracle Network Hospitals® by raising funds and awareness that provide 32 million treatments each year to kids across the U.S. and Canada.

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Additional Purchase Options


Get the 17 monsters from Mordenkainen's Fiendish Folio Volume 1 for use on D&D Beyond. You may also purchase individual monsters.

Individual Purchase Items

  • Assassin Bug
  • Blindheim
  • Crab Folk
  • Dire Corby
  • Fog Giant
  • Forlarren
  • Jermlaine
  • Khargra
  • Killmoulis
  • Mite
  • Needle Lord
  • Needle Spawn
  • Norker
  • Norker War Leader
  • Screaming Devilkin
  • Xill
  • Ygorl, Lord of Entropy

Compendium Content Only

Purchasing this bundle unlocks the Mordenkainen's Fiendish Folio Volume 1 book in digital format in the game compendium with all the artwork and maps, cross-linking, and tooltips.

The Compendium Content bundle does not grant access to all the content's options in the rest of the toolset, such as the searchable listings, character builder, or digital sheet.