Monster 404

You're walking through the forest. It's dark around you, only the faint moonlight illuminates something through the trees and fog. You suddenly feel someone's breath behind you and, startled, turn around to see who's there. Surprisingly, there's no one there, only the leaves of the trees swaying above. You raised an eyebrow and continued walking, but now with apprehension. And then, suddenly, you're hit with a bat and you pass out. You wake up a long time later, in someone's house, on a bed. You have a terrible headache.