Monstrosities: Wererat Swarmer (Patreon)

Wererat Swarmers are mindless monstrosities that live among hundreds of rats and are catalysts for plagues. 20% of wererats turn into swarmers within the first 5 years of being cursed with lycanthropy. Wererats that will become swarmers usually start noticing symptoms of their evolving curse a year before they turn into a swarmer. Most wererats are exiled or exile themselves from the rest of wererat society before they turn into a rat controlling rabid beast and create their lair.

Art by Artem Grigoryan on Artstation