SRD & OGL creatures — full stat blocks. Each entry links its source.
| Name | Type | Size | CR | Source |
|---|---|---|---|---|
| Lymarien | Fey | Tiny | 1/8 | Tome of Beasts 2 |
| Lymarien Swarm | Fey | Large | 5 | Tome of Beasts 2 |
| Mage | Humanoid | medium | 6 | Black Flag SRD |
| Mage | Humanoid | Medium | 6 | Level Up Advanced 5e Monstrous Menagerie |
| Mage | Humanoid | Medium | 6 | 5e Core Rules |
| Mage Apprentice | Humanoid | medium | 1 | Black Flag SRD |
| Magma Mephit | Elemental | Small | 1/2 | Level Up Advanced 5e Monstrous Menagerie |
| Magma Mephit | Elemental | small | 1/2 | Black Flag SRD |
| Magma Mephit | Elemental | Small | 1/2 | 5e Core Rules |
| Magma Octopus | Elemental | Large | 8 | Tome of Beasts 2 |
| Magmin | Elemental | Small | 1/2 | Level Up Advanced 5e Monstrous Menagerie |
| Magmin | Elemental | Small | 1/2 | 5e Core Rules |
| Magmin | Elemental | small | 1/2 | Black Flag SRD |
| Magnetic Elemental | Elemental | Large | 6 | Tome of Beasts 2 |
| Mahoru | Monstrosity | Large | 3 | Tome of Beasts 2023 |
| Mahoru | Monstrosity | Large | 3 | Tome of Beasts |
| Major Malleable | Aberration | Huge | 10 | Tome of Beasts 2 |
| Malakbel | Fiend | Medium | 9 | Tome of Beasts 2023 |
| Malakbel | Fiend | Medium | 9 | Tome of Beasts |
| Malcubus | Fiend | Medium | 4 | Level Up Advanced 5e Monstrous Menagerie |
| Mallqui | Undead | Medium | 8 | Tome of Beasts 2023 |
| Mallqui | Undead | Medium | 8 | Tome of Beasts |
| Malmbjorn | Monstrosity | Huge | 15 | Tome of Beasts 3 |
| Malphas | Fey | Medium | 6 | Tome of Beasts 2023 |
| Malphas (Storm Crow) | Fey | Medium | 6 | Tome of Beasts |
| Mamura | Aberration | Small | 6 | Tome of Beasts 2023 |
| Mamura | Aberration | Small | 6 | Tome of Beasts |
| Mandrake | Plant | Tiny | 1/2 | Creature Codex |
| Mandriano | Plant | Large | 5 | Creature Codex |
| Manggus | Giant | Large | 5 | Tome of Beasts 2 |
| Mangrove Treant | Plant | Huge | 7 | Tome of Beasts 2 |
| Manticore | Monstrosity | Large | 3 | 5e Core Rules |
| Manticore | Monstrosity | large | 3 | Black Flag SRD |
| Manticore | Monstrosity | Large | 3 | Level Up Advanced 5e Monstrous Menagerie |
| Map Mimic | Monstrosity | Tiny | 1/4 | Tome of Beasts 2023 |
| Map Mimic | Aberration | Tiny | 1/4 | Tome of Beasts |
| Mari Lwyd | Undead | Large | 4 | Tome of Beasts 2 |
| Marid | Elemental | Large | 11 | Level Up Advanced 5e Monstrous Menagerie |
| Marid Noble | Elemental | Large | 11 | Level Up Advanced 5e Monstrous Menagerie |
| Marilith | Fiend | Large | 16 | Level Up Advanced 5e Monstrous Menagerie |
| Marilith | Fiend | Large | 16 | 5e Core Rules |
| Beast |
| Medium |
| 2 |
| Creature Codex |
| Construct |
| Large |
| 2 |
| Tome of Beasts 2 |
| Beast |
| Huge |
| 6 |
| 5e Core Rules |
| Beast |
| huge |
| 6 |
| Black Flag SRD |
| Beast |
| Huge |
| 6 |
| Level Up Advanced 5e Monstrous Menagerie |
| Beast |
| Medium |
| 4 |
| Tome of Beasts |
| Construct |
| Medium |
| 8 |
| Creature Codex |