Eragon wanted to defeat Galbatorix but he is the most powerful and cruel of all the riders who ever lived in Alagaesia. Galbatorix had the most Eldunari so Eragon got some that were hidden in the rock of Kuthian; then he and his Eldunari made Galbatorix understand what he had done, and then killed him.
It was a great book. I like the writer and it kept me reading, so thumbs up! I liked the contents, like elves and dragons.