A Clash of Kings
"And Now His Watch Is Ended" was written by showrunners David Benioff and D. B. Weiss. It was based on George Martin's novels, chapters Tyrion X from "A Clash of Kings" and Jaime IV, Tyrion II, Samwell II, the first part of Arya VI, and the second half of Daenerys III from "A Storm of Swords".