Potwory 
The First Dragon
Part of the First Dragon Quest....
The Flaming Orchid
As part of the Asura Palace Quest, access to the boss is granted every 20 hours but requires defeating 3 Cave Hydras and 2 Greater Fire Elementals eac...
The Frog Prince
Its raid can not be blocked. Added in Updates/8.2, spawns near Alatar Lake with another green frog. Looks the same as a Green Frog.
<gallery perrow="1...
The Gravedigger
Part of The Roost of the Graveborn Quest.
Is not affected by Challenge. Usually targets the closest player....
The Handmaiden
Pacera was the first server to kill it. '''The Handmaiden''' is the Hand of Cursed Fate boss....
The Horned Fox
The Hungerer
Rare Spitter boss found on the bottom of the Hive Outpost in Liberty Bay, in a ~20-minute Varying Monster Spawn in which the common creatures are a Hi...
The Imperor
The Imperor is the Diabolic Imp boss. It was killed first time on Solera, later on Pacera and Refugia.
<noinclude><gallery mode="nolines">
Image:Imper...
The Last Lore Keeper
This is the last boss in the Forgotten Knowledge Quest....
The Lily of Night
Part of The Secret Library Quest....
The Lord of the Lice
It looks like Mutated Rats. It will yell when summoning creatures....
The Manhunter
Rare Spidris boss found on the bottom of the Hive Outpost in Liberty Bay, in a ~20-minute Varying Monster Spawn in which the common creatures are a Hi...
The Mean Masher
A rare Hive Overseer boss found on the bottom of the Hive Outpost in Liberty Bay, in a ~20-minute Varying Monster Spawn in which the common creatures ...
The Mega Magmaoid
Part of the Too Hot to Handle Quest....
The Monster
The Monster is a creation of Doctor Marrow.
It's the final boss of The Cradle of Monsters Quest....
The Moonlight Aster
As part of the Asura Palace Quest, access to the boss is granted every 20 hours but requires defeating 2 Vicious Liches and 2 Vile Destroyers each tim...
The Mutated Pumpkin
It spawns every 4 hours, beginning a few seconds after Server_Save#Server_Save,_Server_Boot,_and_Server_Open (not to be confused with Server Save) dur...
The Nightmare Beast
The Old Whopper
New creature in Updates/8.2. He spawns with several cyclopes smiths....
The old Widow