The settlers who lived in the houses outside were adherents of Arisetsu, the goddess of hope and warmth. You know what that means, right? Blankets! Arisetsu nuts always bring tons of blankets to give to the needy. Well, they're dead, and we're the needy. They brought a lot of their stuff into this cave when they fled, but when they died, they were buried in... you guessed it: blankets. So now we're very low. I'm betting that there's more blankets in those houses, though. Sneak past the ghosts and get us some!