Rat

Rats prefer to live underground, venturing aboveground only at night. They skulk

the sewers and dark alleyways of town and cities, drawn by the abundance of food, and occasionally inhabit dark caves, ruins, and dark thickets in the wilderness.

Lore
Religion wise, rats are sacred creatures to Torog, the King That Crawls. Their presence signifies plague, decay, and collapse in decadent cities. Subspecies of rats include giant rats, dire rats and swarms.

In the campaign
While the Company of Valladilene was after a Darkwood Company's cluster close to the Goldplains, they went through the underground tunnel-like caverns of Elyas' Rest. Once there, they encountered a number of wild rats, that managed to infect Bel Mikal with a disease that lasted for about 2 days (under care), ravishing him with fever and pains, before they were put down.