Those small rodents are everywhere. Hidden in the smallest caves, behind rocks or under mushrooms; they are an easy find. Once possessed, they'll allow you to go through smaller spaces and continue your journey.
Don't worry, our rats are friendly, they don't bite or scratch! During your exploration of the tunnels, you may find yourself hunted. Feeling something lurking in the shadows, in the corners of corridors.
The nightrunners are their main predators of our little rodents, and they want a taste of them. Your best bet would be to flee rapidly in another hole, or hide yourself if you can!