>>96332707
I do something similar (one of the magics of my setting, "wild magic" in a sense, is called verms, they are proto-elementals/biological magic, in all kidns of forms from fungi to bacterial-like etc), they can infect very unhealthy or dead animals and beasts (let's call magical potent animals beasts), so they "rise" and become amalgamations of stuff like beehives, tumorous looking growths, fake osteodermos etc
They are either controlled be said verms, or get mad be pain as forcerd Verm inoculation is very rapacious (without proper diet and suplementation they devour the host). Such animals are normally either called just monsters as a general term or aberrations in the most concise ones.
It lets me have a great variety of monster of the week, just pic an animal (or a monster/dinosaur/pokemon, whatever your fancy), search for some spells than would be cool for it to have (I use a Strombringer/mythras/RQ d100 based game) like Bladesharp(the claws of the monster vibrate like angry bees), Protection (osteo-derms like growth, than move of they own volition) or Cause disae (a boil than explodes with all kinds of pus and other unsavory creepy crawlies over an unfortunate PC) and let it loose. You could even try to make it about stalking, looking at ways to destroy the verms than infect the monster (Salt, Iron, Silver being the most common, normally one of those will work at least partially) and kill it out of mercy. You can play to make it look pitiful so its an act of charity if you have people than don't like to kill monsters.