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Viserion is a recurring character in the A Song of Ice and Fire series, as well as its television adaptation, Game of Thrones.
Viserion is one of Daenerys Targaryen's three dragons, or "children", along with his brothers, Drogon and Rhaegal. After being killed beyond the Wall and subsequently resurrected as an undead dragon by the Night King during Season 7 of the television series, it has become a villain as well as the Night King's personal mount.
Viserion is responsible for the partial destruction of the Wall at Eastwatch-by-the-Sea at the end of Season 7.
He was named after the late Viserys Targaryen, in his memory.
When Daenerys learns that Jon Snow and his ranging party were struggling against the White Walkers and the undead army beyond the Wall, she and her three dragons fly to rescue them in a desperate mission. During the mission, the Night King throws a spear made of ice through Viserion's neck, mortally wounding him and causing him to fall through the sky into the frozen lake. After Jon, Dany and the others flee, the wights use several massive chains to drag Viserion's corpse from the frozen waters. The Night King then uses his magical powers to revive Viserion as a massive wight dragon.
Later, when the army of the dead finally arrives at the Wall, at Eastwatch-by-the-Sea, the Night King is shown riding Viserion. Having apparently gotten more powerful and faster now that he had been raised into undeath, Viserion breaths blue fire and destroys the westernmost portion of the Wall, allowing the White Walkers and their undead minions to finally cross over into the Seven Kingdoms once again after thousands of years.