Extinction

Extinction is the fourth book in the War of the Spider Queen series.

"Lies, Faith, and Oblivion.

The Queen of the Demonweb Pits may have turned her back on even her most faithful servants, or she may now hang lifeless in her own hellish webs. For one priestess, the only course left open to her is to discover the truth, even if she must return to a place from whence few have returned even once&mdash;a place where souls of the dead go to serve for eternity. For another priestess, the prospect of an afterlife without the Spider Queen drives her into the arms of another goddess, shattering the tenuous alliances that have brought the drow to the threshold of the Abyss."