The Gyptians form an expedition to the Arctic with Lyra to rescue the children. Lyra recruits Iorek Byrnison, an armoured bear, and his human aeronaut friend, Lee Scoresby. She also learns that Lord Asriel has been exiled, guarded by the bears on Svalbard. Near Bolvangar, the Gobbler research station, Lyra discovers an abandoned child who has been cut from his dæmon; the Gobblers are experimenting on children by severing the bond between human and dæmon. Lyra is captured and taken to Bolvangar, where she is reunited with Roger. Coulter tells Lyra that the intercision prevents the onset of troubling adult emotions. Lyra and the children are rescued by Scoresby, Iorek, the Gyptians, and Serafina Pekkala's flying witch clan. Lyra falls out of Scoresby's balloon and is taken by the panserbjørne to the castle of their usurping king, Iofur Raknison. She tricks Iofur into fighting Iorek, who arrives with the others to rescue Lyra. Iorek kills Iofur and takes his place as the rightful king.