| Name | Map Tool Token Link | Family | Type | Size | CR |
|---|---|---|---|---|---|
| Udoroot | RPTok | Udoroot | Plant | Huge | 5 |
| Umber Hulk | |
Umber Hulk | Aberration | Large | 7 |
| Truly Horrid Umber Hulk | |
Umber Hulk | Aberration | Huge | 14 |
| Umbral Blot | RPTok | Umbral Blot | Construct | Medium | 32 |
| Unbodied | RPTok | Unbodied | Monstrous Humanoid | Medium | 5 |
| Unicorn | |
Unicorn | Magical Beast | Large | 3 |
| Uvuudaum | RPTok | Uvuudaum | Outsider | Large | 27 |