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The mages of Blackstar Castle have been experimenting with dead animals and even dead humans to turn into monsters. They even succeeded combining and synthesizing human body parts to make new monster types, like the Tarvos(basically a regular centaur) and Mogall(a floating eyeball that casts dark magic).
Meanwhile, Hunthounds are made with illegally kidnapped stray canines all over Aurorai, resulting in a beast that's fast and is at least 3x more vicious than an average wolf.
Lastly, their study of necromancy led them to the Revenant (aka zombies) and Bone Warriors (skeletons). "Helping" them is a certain necromancer blackmailed with extermination from the entiriety of Blancopolis after it was rumored she flouted The Red Doctrine.