| Name | Map Tool Token Link | Family | Type | Size | CR |
|---|---|---|---|---|---|
| Yak Folk | RPTok | Yak Folk | Monstrous Humanoid | Large | 4 |
| Yeth Hound | |
Yeth Hound | Outsider | Medium | 3 |
| Yrthak | |
Yrthak | Magical Beast | Huge | 9 |
| Yuan-Ti Abomination | |
Yuan-Ti | Monstrous Humanoid | Large | 7 |
| Yuan-Ti Halfblood | RPTok | Yuan-Ti | Monstrous Humanoid | Medium | 5 |
| Yuan-Ti Pureblood | |
Yuan-Ti | Monstrous Humanoid | Medium | 3 |
| Arcanaloth | |
Yugoloth | Outsider | Medium | 17 |
| Marraenoloth | |
Yugoloth | Outsider | Medium | 10 |
| Yagnoloth | |
Yugoloth | Outsider | Large | 10 |