| Name | CR | Type | Environment |
| Ferrofluid Ooze, Ferrofluid Magneto-Cluster | 12 | ooze | urban |
| Ferrofluid Ooze | 2 | ooze | any |
| Flayer Leech | 4 | vermin | any land |
| Flayer Leech, Flayer Leech Effigy | 15 | monstrous humanoid | any land |
| Formian, Formian Myrmarch | 10 | monstrous humanoid | any land or underground (Castrovel) |
| Formian, Formian Queen | 17 | monstrous humanoid | any land or underground (Castrovel) |
| Formian, Formian Taskmaster | 7 | monstrous humanoid | any land or underground (Castrovel) |
| Formian, Formian Warrior | 3 | monstrous humanoid | any land or underground (Castrovel) |
| Formian, Formian Worker | 1/2 | monstrous humanoid | any land or underground (Castrovel) |
| Frujai, Frujai Colony | 19 | plant | any forests (Orikolai) |
| Frujai, Frujai Soldier | 12 | plant | any forests (Orikolai) |