Wiki on Maggy. Most of this stuff is known both in the books and the show. Just a matter of who (valonqar) kills her now. There’s tons of interweb theories dissecting and analyzing any and all mentions of valonqar. Cersei: When will I wed the prince? Maggy: Never. You will wed the king. Cersei: I will be queen, though? Maggy: Aye. Queen you shall be... until there comes another, younger and more beautiful, to cast you down and take all that you hold dear.[1] —Maggy in the dream of Cersei Lannister Cersei: Will the king and I have children? Maggy: Oh, aye. Six-and-ten for him, and three for you. Gold shall be their crowns and gold their shrouds, she said. And when your tears have drowned you, the valonqar shall wrap his hands about your pale white throat and choke the life from you.[1] —Maggy in the dream of Cersei Lannister