Stormcloud hatched from the egg laid in the cradle of Prince Aegon, Rhaenyra's elder son by Daemon and the future Aegon III, and was still a young dragon his nine-year-old rider had never mounted when the Dance of the Dragons began. The books do not give his color; the author has described him to an illustrator as turquoise with black horns and claws.
Late in 129 AC Prince Jacaerys sent his half-brothers Aegon and Viserys to the safety of Pentos aboard the cog Gay Abandon, Aegon with Stormcloud and Viserys with his egg. In the Gullet the cog and her escorts were taken by the warships of the Three Daughters, and Aegon escaped only by climbing onto Stormcloud's back and flying for the first time in his life. He reached Dragonstone clinging to the dragon's neck, but Stormcloud came home with the stubs of countless arrows in his belly and a scorpion bolt through his throat, and died within the hour, hissing, his hot blood running black and smoking from his wounds. Aegon never flew again.