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Trail of Oil is the 33rd chapter of Eragon. It takes the point of view of Eragon.
Summary[]
Eragon and Brom go around Dras-Leona asking people about Seithr Oil. Eragon has no luck, but Brom returns with the information that Galbatorix will arrive within a week to depose Marcus Tábor, and that two slaves bring the Seithr Oil into Helgrind. They try to think of ways to sneak into Helgrind and then go to bed.