They explained it last episode.
The Night King, he reveals, has one goal: to erase Westeros, their world. As Bran reveals, “I am its memory.” This idea is helpfully clarified just moments later by Sam, who explains that Bran’s “memories don’t come from books. And your stories aren’t just stories. If I wanted to erase the world, I’d start with you.”
The Three-Eyed Raven, according to Bran, is a living history of Westeros: a force whose job it is to watch over the world and keep it safe, but also to keep its secrets. For this reason, the Night King wants to hunt down Bran — now officially the Three-Eyed Raven — not only to destroy the world’s present, but its past as well.
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