| Name | Family | Level | Alignment | Creature Type | Size |
| Tarn Linnorm | Linnorm | 20 | Chaotic Evil | Dragon | Gargantuan |
| Tarrasque, The Armageddon Engine | Spawn of Rovagug | 25 | Chaotic Evil | Beast | Gargantuan |
| Tengu | — | 2 | Chaotic Neutral | Humanoid | Medium |
| Terotricus | — | 19 | Chaotic Evil | Fungus | Gargantuan |
| Tidal Master | Elemental, Water | 9 | Neutral | Elemental | Large |
| Tiefling | Planar Scion | 3 | Chaotic Evil | Humanoid | Medium |
| Tiger | Cat | 4 | Neutral | Animal | Large |
| Tixitog | — | 3 | Neutral Evil | Aberration | Medium |
| Tor Linnorm | Linnorm | 21 | Chaotic Evil | Dragon | Gargantuan |
| Treerazer | — | 25 | Chaotic Evil | Fiend | Huge |
| Triceratops | Dinosaur | 8 | Neutral | Animal | Huge |
| Troll King | Troll | 10 | Chaotic Evil | Giant | Large |
| Troll | Troll | 5 | Chaotic Evil | Giant | Large |
| Tyrannosaurus | Dinosaur | 10 | Neutral | Animal | Gargantuan |
| Tzitzimitl | — | 19 | Neutral Evil | Undead | Gargantuan |