The spiders are an interesting one. Since the Matriarch happens to be a Drow, which is why it drops the robes. There's a book referecing that she finally found a way to become a spider in the little camp area underground.
Meaning that the village had not just 1, but 2 complete nutjobs inhabiting it.
There's some partially destroyed books around there that as I recall provide some more information about the area, but I can't recall the details from the top of my head.
