Quick recap
In Castrima, a comm inside a geode where orogenes live openly under Ykka's leadership, Essun learns from Alabaster, who is turning to stone, what the obelisks are and about the silver energy beneath orogeny, which he calls magic. Meanwhile, Nassun's father takes her south in search of a cure and reaches a community where Schaffa, his memory gone, looks after orogene children. Nassun learns fast and grows attached to him. When her father tries to kill her, she turns him to stone. Castrima is besieged by the rival comm Rennanis. Essun connects every obelisk in the world, forms the Obelisk Gate and turns the invaders to stone. Alabaster dies, fully petrified, and the damaged Castrima has to leave.

