The Eight Legged Librarians
Superficially resembling driders, the ELL are the distant spawn of Atlach-Nacha, the Great Old Spider God. They have arachnid bodies, and use their mandibles as humans use their hands. Rather than having the upper torso of a drow, they have the head and partial torso of a human protruding from their thorax. This can be minimal, not much more than a face studded with too many eyes to the lurid, a lovely lass, breasts exposed, extruded from the chitinous carapace of a mottled brown and black spider. They are caretakers in some parts of the library, predators in other parts, and they create their webs not from silk, but from hints, scattered pages of musty tomes, and the promise of greater secrets in the next section of the library. The victim doesn't fall into an actual web until they are quite far from any sort of assistance, in a fallen and decrepit section of the library.