Shadow of Doom is the 57th chapter of Brisingr. It takes place from the view of Eragon, and, for part of the chapter, that of Glaedr.
Summary[]
Eragon and Arya rush to defeat the Shade as Oromis and Glaedr fight Murtagh and Thorn. When Murtagh and Thorn seem defeated, Galbatorix takes them over. With his superior magical ability he fights them back. Oromis suffers a seizure and he drops Naegling. The possessed Murtagh strikes him down, and Thorn kills Glaedr's body. In Feinster, the Shade Varaug attacks Eragon and Arya before being stabbed through the heart by Arya, now Arya Shadeslayer.