| Name | Attribute | Level | Type |
|---|---|---|---|
| Unknown treasure | - | 50 | General Monster |
| Unholy Sprite | 55 | General Monster | |
| Undying Elegance | 110 | General Monster | |
| Underground Crustdrone | - | 80 | General Monster |
| Undead Warrior | 83 | General Monster | |
| Undead Spirit Warrior | 83 | General Monster | |
| Undead Soldier | 85 | General Monster | |
| Undead Soldier | 85 | General Monster | |
| Undead Prowler | 44 | General Monster | |
| Undead Pirate | 76 | General Monster | |
| Undead Maniac | 43 | General Monster | |
| Undead Knight | 57 | General Monster | |
| Undead Knight | - | 60 | General Monster |
| Undead Fangbat | 57 | General Monster | |
| Undead Corpse | 85 | General Monster | |
| Undead Corpse | 85 | General Monster | |
| Undead Armor | - | 1 | General Monster |
| Umbral Lamassu | 55 | General Monster | |
| Umbral Lamassu | 55 | General Monster | |
| Ultimate Blade · Moonshade | - | 98 | General Monster |
| Ulala | 55 | General Monster | |
| Twolip | 33 | General Monster | |
| Twolip | - | 41 | General Monster |
| Twilight Totem | - | 55 | General Monster |
| Tusked Wild Boar | 83 | General Monster | |
| Turkey | - | 1 | General Monster |
| Tung Tree | - | 1 | General Monster |
| Trove Protector Treasurebot Mk.XI | 30 | General Monster | |
| Trove Patrol | 48 | General Monster | |
| Trove Patrol | 48 | General Monster | |
| Trove Guardian Saki | 31 | General Monster | |
| Trove Fire Spirit | 28 | General Monster | |
| Trove Fire Spirit | 48 | General Monster | |
| Trove Bot - VI | 48 | General Monster | |
| Trove Bot - VI | 48 | General Monster | |
| Tropical Tortophant | 46 | General Monster | |
| Tribe Champion | - | 50 | General Monster |
| Tribbet | 34 | General Monster | |
| Tree of Terror | - | 113 | General Monster |
| Tree of Terror | - | 113 | General Monster |
| Tree Spirit Slime | - | 113 | General Monster |
| Tree Spirit Slime | - | 113 | General Monster |
| Tree Dweller | - | 108 | General Monster |
| Tree Dweller | - | 108 | General Monster |
| Treant | 60 | General Monster | |
| Treant | 60 | General Monster | |
| Toxitoads | 18 | General Monster | |
| Toxin-Immune Vine | 90 | General Monster | |
| Toxic Twolip | 55 | General Monster | |
| Toxic Spores-Immune Vine Tree | 108 | General Monster |