| Name ▼ | Type | CR | Version | Book |
|---|---|---|---|---|
| Fiendish Orc | Fiend | 4 | 2014 | Critical Role: Call of the Netherdeep |
| Fiendish Icon | Construct | 1 | 2014 | A Bastion of Hope |
| Fiendish Giant Spider | Beast | 1/2 | 2014 | Out of the Abyss |
| Fiendish Formian | Fiend | 4 | 2014 | Chains of Asmodeus |
| Fiendish Flesh Golem | Construct | 8 | 2014 | Baldur's Gate: Descent Into Avernus |
| Fiendish Auger | Construct | 5 | 2014 | Phandelver and Below: The Shattered Obelisk |
| Fiend Cultist | Humanoid | 8 | 2024 | 2024 Monster Manual |
| Fidelio | Undead | 4 | 2014 | Waterdeep: Dungeon of the Mad Mage |
| Fhenimore | Humanoid | 5 | 2014 | Locathah Rising |
| Feyr | Aberration | 5 | 2014 | Boo's Astral Menagerie |