| Name | CR | Type | Environment |
| Maraquoi, Maraquoi Hunter | 1/2 | humanoid (maraquoi) | any (Marata) |
| Maraquoi, Maraquoi Shaman | 8 | humanoid (maraquoi) | any (Marata) |
| Mi-Go | 6 | plant | any |
| Mi-Go, Mi-Go High Priest | 11 | plant | any |
| Moonflower | 8 | plant | any land |
| Moonflower, Moonflower Titan | 16 | plant | any land |
| Morlamaw | 3 | monstrous humanoid (aquatic) | any water (Arniselle) |
| Morlamaw, Morlamaw Mayor | 9 | monstrous humanoid (aquatic) | any water (Arniselle) |