The key difference between a monster and a beast is their patron Gods. Whilst beasts were created by and serve Zolga, monsters belong to her sister Durza. Most monsters are either an amalgamation of creatures, such as the Chimera, a corruption of mortal races such as the Minotaur or a particularly monstrous beast with magical abilities, such as the Hydra. Durza created monsters for one purpose: to torment the mortal races below and make a mockery of her sister's work. Monsters are made with a deep-seated hatred for all mortal races and are always aggressive towards them, though there are some exceptions, mostly Goblinoids and Ogroids.
Monsters live in all corners of the globe, thriving and festering where mortals and regular beasts cannot. Monsters are so diverse that they have been divided into different subgroups to help categorise and differentiate them based on different traits, as seen below. Whilst the monsters listed below are extensive, they by no means cover all monsters in existence. Durza is constantly making waves of new creations to let loose on the mortals, most of which are never seen again after their initial arrival. These monsters are not detailed here, as they don't last long and oftentimes aren't even given names. The monsters that are listed below are presumably Durza's favourites as they've been around for years no matter how many are slain or how often they are wiped out.