Potwory 
Terror Bird
They are faster but a bit weaker than a Cyclops. These creatures will kill other monsters and move objects to get to you. They can be tamed to a mount...
Terrorsleep
<gallery captionalign="center" mode="nolines">Terrorsleep Artwork.jpg|Official Creature Artwork</gallery>...
Thaian
It's part of the Feaster of Souls Quest....
Thalas
Thalas, the royal alchemist, was sentenced to be locked away, after his part in the conspiracies against the pharaoh. You can camp this monster by sum...
Thanatursus
<gallery captionalign="center" mode="nolines">Thanatursus Artwork.jpg|Official Creature Artwork</gallery>...
Thawing Dragon Lord
In order to find this special creature, you must first wake it by using the Frozen Dragon in its room, after having talked to the Crowned Tree. Upon s...
The Abomination
The Abomination is a raid boss that spawns approximately every 180 days. When this raid happens, it starts with the Abominable Spawn appearing in 4 ou...
The Baron from Below
Part of the Dangerous Depths Quest....
The Big Bad One
New creature in Updates/8.2.
<gallery widths="120" heights="120" mode="nolines">
File:UO0066.jpg| and The Big Bad One
File:UO0046.jpg| and The Big Bad...
The Blazing Rose
The Blightfather
It is the Lancer Beetles' boss that spawns with their raid in Muggy Plains (30 minutes after the initial raid message).
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The_B...
The Brainstealer
It's the final boss of the Too Hot to Handle Quest....
The Count of the Core
Part of the Dangerous Depths Quest....
The Diamond Blossom
The Dread Maiden
The Dread Maiden's is initially strong to all damage types, however, as the battle progresses it will be weakened to the point it takes damage in a no...
The Duke of the Depths
The Enraged Thorn Knight
This is one of the bosses in the Forgotten Knowledge Quest. It looks like a Crystal Warlord Outfits and is one form of the Thorn Knight....
The Evil Eye
It's the Bonelords' Boss. It can cause Death Damage and all different kinds of Magical Damage. Always spawns with 5 Bonelords and 3 Elder Bonelords ne...
The False God
Part of the Cults of Tibia Quest....
The Fear Feaster
It's part of the Feaster of Souls Quest....