Lord Zack's Planescape
The Demonweb is the Abyssal realm of the drow demon goddess Lolth. The layer is filled with a web-like structure, with passages radiating out like the strands of a spider’s web. There are many portals some to other layers Lolth rules, others to Material Plane worlds where Lolth has interests. Lolth has conquered entire worlds and absorbed them into the Demonweb. It is rumored that Lolth’s true divine realm is not the Demonweb itself, but another, secret realm accessible through the deepest depths of the Demonweb.