Brisingr

Eragon and Saphira begin their progress toward Ellesméra inside Du Weldenvarden, leaving Tronjheim behind as they fly through the valley between the mountains of Farthen Dûr, which are too high to pass over. They rest and sleep on the first night in an attempt to bring Saphira’s energy up, but the next day is windy and tiring, and Saphira insists they continue on. It takes longer than expected, but they reach Du Weldenvarden’s outer edges by evening and scry with Oromis. They ask if they can be taught through the mirror, but Oromis says they cannot pass on their knowledge without being face-to-face. This means Saphira must fly even further to gain what they need. As Eragon saddles up again, they make plans to visit the Menoa tree while they’re in the area because Solembum the werecat told them they’d find a weapon there that would need to be activated by saying its name at the Rock of Kuthian to open the Vault of Souls. They are unsure how much of this is metaphorical, as neither Eragon nor Saphira have heard of the Rock or the Vault.