Daenerys went all Mad Queen, so her lover/nephew took it upon himself to end her reign. As Dany embraced Jon, he stabbed her. Drogon retaliated by not burning Jon to smithereens. Instead, the creature melted the Iron Throne, before picking up his mother's corpse and flying away. Oh, and Bran who will always be remembered as that kid with white eyes who mumbled for eight seasons was made King.