Lavellan

Generally considered to be a kind of rodent. They are reportedly larger than rats, very noxious, and lived in deep pools in rivers. Its poisonous abilities are legendary, and it is said to be able to injure cattle over a hundred feet away. Their appearance is more akin to a combination of rat and shrew, with patchy brown fur and a visible green, noxious steam that rises perpetually from their bodies. The mere presence of their nest can contaminate water sources, cause crops to become rotten, and spread diseases across a population. They can be killed with conventional tactics.