The penultimate season focuses on the convergence of the show's main plotlines in preparation for the final season. Daenerys Targaryen arrives in Westeros with her army and three large dragons and begins to wage war against the Lannisters, who have defeated her allies in the south and west of Westeros. Jon Snow leaves Sansa in charge of Winterfell and visits Daenerys to secure her help to defeat the White Walkers and the Army of the Dead. He mines the dragonglass at Dragonstone and begins a romance with Daenerys. Meanwhile Arya and Bran (now the Three-Eyed Raven) return home to Winterfell; the Starks execute the treacherous Littlefinger. Tyrion persuades Daenerys not to destroy King's Landing, reminding her that she does not want to be simply a queen of ashes. Instead, Jon goes North above the wall to capture a wight to prove to Cersei that the fearsome army of the dead exist and are coming; in doing so, his group is pinned down and nearly killed. Daenerys rescues them with her dragons, but the Night King kills one of her dragons and makes it part of his army. The undead dragon later destroys part of the Wall, and the dead march through. Bran learns that Jon is really his cousin, Aegon Targaryen, the legitimate heir to the Iron Throne.