| Name | Map Tool Token Link | Family | Type | Size | CR |
|---|---|---|---|---|---|
| Ice Devil | |
Devil | Outsider | Large | 13 |
| Immoth | |
Immoth | Elemental | Large | 9 |
| Imp | |
Devil | Outsider | Tiny | 2 |
| Infernal | |
Abomination | Outsider | Large | 26 |
| Intellect Devourer | |
Intellect Devourer | Aberration | Small | 7 |
| Invisible Stalker | |
Invisible Stalker | Elemental | Large | 7 |
| Iron Colossus | |
Colossus | Construct | Colossal | 33 |
| Iron Golem | |
Golem | Construct | Large | 13 |
| Iron Half-Golem | |
Half-Golem | Construct | Medium | 4 |
| Average Ixitxachitl | |
Ixitxachitl | Aberration | Small | 1 |
| Vampiric Ixitxachitl | |
Ixitxachitl | Aberration | Small | 3 |