Lolth

With the drow, there comes Lolth.
The goddess of darkness, webs (in all senses of the word) and manipulation.
Lolth is the patron goddess of the drow and many dark elves dream that one day she will rise to the material plane as the queen of Camille the Betrayer and usher in a period of darkness across Alturis.
Her Holy book is a scripture simply called "The Web"
Persicorum notably fought the Denizen drow in one of their undermountain temples and found newly built shrines to the spider queen Lolth within.