1. Murdered En Masse at the Red Wedding
Who: Robb, Talisa, and Catelyn Stark
Gory details: “The Lannisters send their regards," Roose Bolton growls, before driving a dagger into Robb Stark's heart. Robb's mother Caetlyn, his wife Talisa (and unborn child), and all of his bannermen are all slaughtered in an eye-popping betrayal. Walder Frey drinks his wine and enjoys the show: Robb is shot with arrows before being stabbed; Talisa is butchered with knife wounds to the stomach; and Catelyn goes down when her neck is slit, though not before trying to bargain for her son's life and killing Walder's wife in the process. Later, the head of Robb's direwolf (Grey Wind) was sewn onto his body, and paraded around for laughs.
Narrative importance: The Red Wedding ends the northern rebellion and puts a question mark around the future of the Stark lineage, since Bran and Rickon are believed to be dead and on the run.
Degree of difficulty: Extremely difficult. The massacre was carefully scheduled to take place after the wedding ceremony and the bedding, a point where none of the Starks expected a thing — they'd eaten bread and salt when they arrived, supposedly guaranteeing their safety. While the musicians played “The Rains of Castamere," Walder gave a short speech, ending with the words “My King has married, and I owe my new Queen a wedding gift." This triggers a rain of arrows from the balcony followed by the main assassinations. Put that on your aspirational royal wedding Pinterest board.
Creative scale: 10