Brisingr by Christopher Paolini

Brisingr, or The Seven Promises of Eragon Shadeslayer and Saphira Bjartskular, is the third book in the Inheritance Cycle by Christopher Paolini. It was released in the United States and other English-speaking countries on September 20, 2008. Originally, the novel was intended to be the last in the Inheritance Cycle, but this changed when Paolini decided that the series was too complex to conclude in one book.