Who Is on What Side in Game of Thrones Season 8?
Game of Thrones: Where All the Major Characters Stand Going Into Season 8
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When Tyrion visits his sister in her chambers, she accuses him of destroying their family and claims that by killing their father, he ushered in the events that led to the death of her two kids, Myrcella and Tommen. The revelation stuns Tyrion, but he deduces Cersei's sudden concern for family points to a pregnancy — and that the hope she has for her unborn child is the only reason she'd consider a truce. With some reluctance, the two come to the agreement that the Lannister army will march north to fight alongside the Starks and Targaryens.
But we soon learn Cersei has no intention of keeping her word. She confesses to Jaime that she deliberately revealed her pregnancy to Tyrion to gain his trust and intends to let her enemies exhaust themselves against the White Walker Army while Euron Greyjoy and the Golden Company wipe out what's left of whoever wins. Jaime is disgusted that his sister plotted behind his back with Euron and elects to ride North, joining the fight against the White Walkers. Cersei declares this a treasonous act worthy of death but lets her brother leave unscathed.
In letting Jaime go unpunished, Cersei may have made a mistake she'll regret later, but the prospect of Jaime Lannister teaming up with Daenerys Targaryen and Jon Snow breeds a world of possibilities.