246 monsters in this familia.
| Name | Type | Size | CR | Source |
|---|---|---|---|---|
| Offal Walker | Undead | Medium | 1 | Tome of Beasts 3 |
| Ogre Flesh Heap | Undead | Large | 4 | Level Up Advanced 5e Monstrous Menagerie |
| Ogre Zombie | Undead | Large | 2 | Black Flag SRD |
| Ogre Zombie | Undead | Large | 2 | Level Up Advanced 5e Monstrous Menagerie |
| Ogre Zombie | Undead | Large | 2 | 5e Core Rules |
| Ogrepede | Undead | Huge | 6 | Tome of Beasts 2 |
| Old Salt | Undead | Medium | 5 | Tome of Beasts 3 |
| Ortifex | Undead | Medium | 4 | Tome of Beasts 2 |
| Overshadow | Undead | Large | 4 | Tome of Beasts 2 |
| Pact Lich | Undead | Medium | 15 | Creature Codex |
| Phantom | Undead | Medium | 1 | Creature Codex |
| Preta | Undead | Medium | 3 | Creature Codex |
| Putrid Haunt | Undead | Medium | 2 | Tome of Beasts 2023 |
| Putrid Haunt | Undead | Medium | 2 | Tome of Beasts |
| Quiet Soul | Undead | Medium | 6 | Creature Codex |
| Reef Bear | undead | Huge | 7 | FTTHelper Original Content |
| Relentless Hound | Undead | Medium | 4 | Tome of Beasts 3 |
| Revenant | Undead | Medium | 5 | Level Up Advanced 5e Monstrous Menagerie |
| Risen Reaver | Undead | Large | 7 | Tome of Beasts 2023 |
| Risen Reaver | Undead | Large | 7 | Tome of Beasts |
| Rotting Wind | Undead | Large | 6 | Tome of Beasts 2023 |
| Rotting Wind | Undead | Large | 6 | Tome of Beasts |
| Rusalka | Undead | Medium | 6 | Tome of Beasts |
| Saltbound Harbinger | undead | Medium | 6 | FTTHelper Original Content |
| Sand Silhouette | Undead | Medium | 6 | Tome of Beasts |
| Sand Silhouette | Undead | Medium | 6 | Tome of Beasts 2023 |
| Sarcophagus Slime | Undead | Medium | 5 | Tome of Beasts 2023 |
| Sarcophagus Slime | Undead | Medium | 5 | Tome of Beasts |
| Scarab, Ruin | Undead | Large | 6 | Tome of Beasts 3 |
| Scroll Mummy | Undead | Medium | 6 | Tome of Beasts 2 |
| Servant of the Unsated God | Undead | Medium | 4 | Tome of Beasts 2 |
| Shadow | Undead | Medium | 1 | Level Up Advanced 5e Monstrous Menagerie |
| Shadow | Undead | Medium | 1/2 | 5e Core Rules |
| Shadow | Undead | Medium | 1/2 | Black Flag SRD |
| Shadow River Lord | Undead | Medium | 9 | Creature Codex |
| Shadow Skeleton | Undead | Medium | 2 | Creature Codex |
| Sharkjaw Skeleton | Undead | Large | 1 | Tome of Beasts 2023 |
| Sharkjaw Skeleton | Undead | Large | 1 | Tome of Beasts |
| Shroud | Undead | Medium | 1/8 | Tome of Beasts 2023 |
| Shroud | Undead | Medium | 1/8 | Tome of Beasts |
| Silver Dragon Wyrmling Skeleton | Undead | Medium | 2 | Tome of Beasts 2 |
| Skeletal Champion | Undead | Medium | 3 | Level Up Advanced 5e Monstrous Menagerie |
| Skeletal Tyrannosaurus Rex | Undead | Huge | 8 | Level Up Advanced 5e Monstrous Menagerie |
| Skeletal Warhorse | Undead | Large | 1/2 | Level Up Advanced 5e Monstrous Menagerie |
| Skeleton | Undead | Medium | 1/4 | Level Up Advanced 5e Monstrous Menagerie |
| Skeleton | Undead | Medium | 1/4 | Black Flag SRD |
| Skeleton | Undead | Medium | 1/4 | 5e Core Rules |
| Skeleton Horde | Undead | Large | 4 | Level Up Advanced 5e Monstrous Menagerie |