Potwory 
The Pale Count
Affected by the boss chest loot system and special AI. When summoning a Nightfiend he says "". Once the Pale Count reaches yellow health he will say "...
The Pale Worm
It's the final boss of the Feaster of Souls Quest, and shares it's health with A Weak Spot....
The Percht Queen
The Plasmother
'''The Plasmother''' is the Defiler boss. It was killed first time on Furora....
The Ravager
He gets healed every time he steps on Stone Tile with lizard symbol....
The Rootkraken
The Sandking
Part of the Cults of Tibia Quest....
The Scourge of Oblivion
The Shatterer
Part of the Ferumbras' Ascendant Quest....
The Snapper
The Souldespoiler
Part of the Cults of Tibia Quest....
The Source of Corruption
It's the final boss of the Cults of Tibia Quest....
The Time Guardian
The Time Guardian, The Freezing Time Guardian, and The Blazing Time Guardian all share a common Health pool, they are among one of five mini bosses in...
The Unarmored Voidborn
This boss is probably Tibia's creature with the highest elemental weakness, but since it has a lot of hitpoints it still takes a while to kill it. Whe...
The Unwelcome
It's part of the Feaster of Souls Quest....
The Voice of Ruin
Spawns with 0-2 Lizard Chosens. Kill it the same way you'd kill a Lizard Chosen....
The Welter
With him spawn 8? Egg (Creature), which hatch to produce Spawn of the Welter, which do very minor damage but heal every monster around it (including T...
The Winter Bloom
As part of the Asura Palace Quest, access to the boss is granted every 20 hours but requires defeating 1 Solitary Frost Dragon and 2 Greater Energy El...
Thornback Tortoise
Thornfire Wolf
Can only appear during the Thornfire World Change. It can be transformed into a Crystal Wolf by luring it towards the Bog Temple....