Prince hates his life, for good reason. His mother is barely around, his father is a jerk, and he often has to live up to his sibling's high standards. When he reaches the end of his wits, he starts to break down going for revenge against everyone he feels wronged him.
Princess Luna knows that the pony in the hood and the mask is not a good being, but there is something familiar about them that she just can't place. With him going after the gems of the world, she decides to watch her through his dreams to see exactly what he is going to do.