Brisingr By Christopher Paolini
This is an example of a metaphor because it is comparing this person to a keystone without using like or as. It is implying that this person is very important and is essential to their quest.
This is an example of a metaphor because it is comparing the sick feeling in his stomach to a knot in his stomach.
This is an example of a simile because it is comparing something that is aggravating him to a splinter burrowing underneath his skin using like or as.
This is an example of personification because saying that the wind sprang up and raced across the plains is giving the wind human like characteristics.