Sybil tells the others about the Weaver’s presence in her room. When the others leave, Benji asks to speak with her. He references having her with him when he returns to Castle Luricht, and Sybil says that she can’t promise that she’ll return with him after they destroy Aisling Cathedral. Benji says that he’ll let her go, but Sybil has a cold feeling.

Benji completes the hamlet’s ceremony, in which the nobles dress him in a spun tunic before pulling its threads apart. Meanwhile, Rory and Sybil discuss her future. She’s unsure of where she’ll go after the Omens are destroyed, but Rory promises to go with her wherever she chooses. Sybil realizes that she’s falling in love with him.

As the ceremony turns into dancing, Rory and Sybil place the flagon of Aisling water and wait for the Heartsore Weaver. She doesn’t come, and the gargoyle tells them that he knows where she is. He leads them, along with Maude and Benji, to a subterranean cave system with an entrance beneath a heavy boulder. Though he’s claustrophobic, Rory jumps in first and then catches Sybil.

The gargoyle, Maude, and Benji join Rory and Sybil in the caves. Sprites that resemble silkworms line the walls. There are three tunnels, each with a tapestry that depicts a phase of the silk process—worms, cocoons, and moths. 

They search the tunnels, and in the third, the gargoyle accidentally pulls a tripwire and releases a torrent of water. They flee and fall into a cavern of gold coins with spikes on the bottom. They haul themselves out, but Rory realizes that he’s missing the Artful Brigand’s coin. He takes off his armor and goes back into the water to search for it. In her peripheral vision, Sybil sees the Heartsore Weaver. She instructs the gargoyle to wait for Rory and follows the Weaver further down the tunnel until she reaches a cavern with an open roof. On a bench lies One’s naked corpse.

Sybil cries, and the Weaver shushes her. She steps into the light, and Sybil sees that the Weaver is entirely stone, resembling an animal gargoyle more than a woman. The Weaver explains that she receives a dead Diviner every 10 years. She tries to bury them as best she can and has made a tapestry of all their shrouds. She tells Sybil that the five magic items were hewn from the stone of the tor. The loom stone can transport the Weaver in space and in memory.

The Weaver knew the abbess back when she was just a stonemason with a foundling child. The abbess asked the Weaver to create the original Diviner robe for the child. Then, she requested five more robes, but the child was gone, replaced by a gargoyle. The Weaver was initially happy to play her part as an Omen and to craft the Diviner robes, but when she returned to her memories of her family, she became sick of her existence. The abbess stopped sending spring water, and the Weaver turned entirely into stone, although the abbess still sends her dead Diviners. 

The Weaver hates the abbess, whose real name is Aisling. She promises to tell Sybil where the loom stone is if Sybil kills her, and Sybil agrees. The Weaver tells her that she returned the loom stone to Aisling when she became more gargoyle than human, revealing that the gargoyles are past Diviners. The very first Diviner, the foundling child, became the first gargoyle, and his name was Bartholomew. Sybil strikes at the Weaver with her hammer and chisel.

Rory and the gargoyle find Sybil with One’s and the Weaver’s bodies. Sybil tells the gargoyle that she knows the ending of his story, and the gargoyle tells her the rest. Bartholomew was a foundling child who died; Aisling found him and fed him spring water, which brought him back to life. The five craftsmen arrived, fought over who should rule, and killed each other. Aisling gave them spring water and resurrected them. She told them that they were gods, but she controlled them like Bartholomew. 

The spring was the abbess’s magic object, and with it, she could control people’s dreams, inventing divination and omens as a way to further control the kingdom. When Bartholomew grew older, he wanted to stop divining, so Aisling starved him of spring water, convinced that he would die. Instead, he became a gargoyle, and he was useful to her again: She sent him to find dying or dead foundling girls to make Diviners. 

Every 10 years, five Diviners are killed and sent to the Omens. The sixth would be turned into a gargoyle. The gargoyle apologizes to Sybil for finding her and taking her to die and be reborn as a Diviner.

The group returns to Aisling Cathedral to kill the final Omen—the abbess. When they breach the gates, Sybil calls out for her. The abbess appears with six gargoyles at her back. Sybil rips off the abbess’s shroud and sees that she is made entirely out of stone. The abbess pulls the loom stone from within her dress and grabs Sybil, transporting them into the cathedral as she instructs her gargoyles to kill the others.

The abbess pushes Sybil into the spring, drowning her while blaming her for the other Diviners’ deaths. The gargoyle, Bartholomew, bites a chunk off her neck, letting Rory pull Sybil out of the spring. Sybil begs the other gargoyles to leave, but they refuse, so she and Rory attack them as Bartholomew attacks the abbess. Finally, Sybil grabs the abbess, drags her into the spring, drowns her, and then places her upon the chancel. She places the chisel over the abbess’s heart and slams it with the hammer, striking her stone body until she is dust.

The group uses their magic items and weapons to destroy Aisling Cathedral. Benji approaches, and before Sybil realizes what’s happening, he stabs Rory in the side and takes the coin. Benji then throws the coin at Bartholomew, destroying his left wing. Both Rory and Bartholomew are alive but badly injured. 

Benji demands that Sybil join him as his queen. Because the abbess kept the truth of divination secret, he can claim that Sybil is the only one capable of knowing people’s futures. If Sybil doesn’t join him, he’ll blame the Omens’ deaths and the cathedral’s destruction on Rory and Bartholomew and will execute them. Maude renounces her knighthood.

Sybil agrees to Benji’s deal as long as he lets Rory, Maude, and Bartholomew go. She watches as Maude drags Bartholomew and Rory away. Benji tells Sybil that she’s free because she now knows the world for what it is. He says that to be all-knowing is to be a god.