Condemnation opens with the party having just fled through the gate from the doomed drow city of Ched Nasad, and arriving in the Anauroch desert. After surviving a series of run-ins with a pack of lamias, they manage to flee underground.
Though upset with Pharaun's idea to visit a priest of Vhaeraun for information on what is happening in the Abyss, Quenthel finally relents. Valas leads them to a gate used back when House Jaelre, which takes them to Myth Drannor.
Back in the Underdark, Nimor continues plans he had been making to urge the duergur of Gracklstugh into war with Menzoberranzen, and manages to enlist the legions of Kaanyr Vhok also.
Pharaun and company trek across the surface to find House Jaelre, but are harried by surface elves along the way. Hallistra is captured, and taken prisoner. She is held for several days, and meets several drow who live on the surface; priestesses of Eilistraee. One of them, Seyll, tries to reform Hallistra.
Getting to House Jaelre, Pharaun and company strike a deal with the high priest of Vhaeraun there, Tzirik. If they can retrieve a spellbook from the dangerous depths of Myth Drannor, he will take them to the Demonweb Pits. They agree, and after a running pitched battle that costs them their lives, they retrieve the spellbook and return to House Jaelre.
Hallistra pretends to be affected by Seyll's attempts to reform her, and an encouraged Seyll decides to take Hallistra to see one of their holy rites. This is her undoing, as Hallistra uses her bardic magic to charm her guards away, and murders Seyll. Hallistra is unnerved though, when Seyll's dying words are that she still has hope for Hallistra. Taking Seyll's gear, she flees to House Jaelre in time to meet her companions.
Tzirik uses an astral spell to bring the party's astral selves to the Abyss. Jeggred stays behind to guard their comatose corporeal bodies. After a few encounters, including one with a goristro, the party makes it to the Demonweb Pits. Finding the entrance to Lolth's realm within the Demonweb sealed with a great stone face, the priestesses pray, plead, and beg Lolth to admit them. Nothing happens. Hallistra, her faith having been fractured, is unable to take being ignored by her deity, and begins to scream curses and hit the stone face, to the horror of her companions. Still, nothing happens, and Hallistra collapses, sobbing, her faith shattered.
Finally sure that Lolth is either unwilling or unable to answer, Tzirik casts a gate spell, and summons Vhaeraun himself, since the drow god apparently cannot approach Lolth's realm on his own. Horrified, Quenthel demands to know what Tzirik is doing, and he laughingly replies that the priestesses have the good fortune to be present at the death of their own deity, even as Vhaeraun begins to smash the great stone face, trying to force his way into Lolth's realm to kill her.
Enraged, Quenthel attempts to strike Tzirik down, but Vhaeraun will not let his priest come to harm. Just as he manages to cut open a gap in the stone face though, Selvetarm, a drow demigod who is Lolth's champion, appears to defend his mistress's realm. The two gods begin to battle.
Everyone is overwhelmed by the spectacle, but Pharaun shakes it off first, and teleports away, apparently leaving everyone else behind. The two gods continue to fight until they tumble off the web strands that compose the Demonweb, plunging into the depths below. Vhaeraun is apparently unable to return, because Quenthel and company see him apparently communing with his god, and begins to cast another gate spell from a scroll. Desperately, the party attacks him, trying to stop him, but although they do delay him, it becomes obvious that's all they're doing, as Tzirik, with his clerical magic and martial prowess, is clearly controlling the fight.
Pharaun, however, had just teleported away to get some room. He sends a sending spell to Jeggred, instructing the draegloth to kill Tzirik's physical body. Apparently he does so, because Tzirik's astral self is torn apart in a gory fashion, ending the astral spell.
Awakening back in House Jaelre, the party regroups and gets out of there before Tzirik's peers can enact revenge. They manage to find an entrance back to the Underdark, and lay down there to rest, much to Jeggred's frustration, since he wants to know what happened in the Demonweb Pits.
That's where it ends.