Dragons. The Song of Ice and Fire equivalent to nuclear weapons. These fire-breathing beasts are able to singlehandedly turn the tide of any battle, and their use in warfare is responsible for the unification of the Seven Kingdoms and the Targaryen dynasty. These are the most powerful dragons ever.
Sunfyre

Described as the most beautiful dragon ever to live, the golden-scaled Sunfyre was the personal mount of Aegon II. Sunfyre served a pivotal role in the Dance of the Dragons, the civil war between the forces of Aegon II and his half-sister Rhaenyra Targaryen that tore Westeros apart. Sunfyre allowed Aegon II to win a number of decisive victories, including the Fall of Dragonstone, which dealt a fatal blow to Rhaenyra’s campaign. The victory was a pyrrhic one, as Sunfyre later died of the wounds he sustained in the battle against the dragon Moondancer, after eating Rhaenyra Targaryen alive, of course.
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