Silvestrus is one of the ninety astrids to battle at Zzyzx. He was one of the six astrids to renounce the Fairy Queen, but he then returned to her during the battle of the Zzyzx.

Silvestrus was apart of the Knights of the Dawn, a group made up of all the astrids designed to protect the Fairy King and Queen. But one day, they let their guard down, and the Demon King, Gorgrog, came and, what they thought, killed the Fairy King. Because of this, the Fairy Queen took away the astrid's power and banished them. Silvestrus and five others thought it was unfair that all the astrids had to be punished and not just the ones who had slipped up, so they renounced the Fairy Queen. But when all the astrids where being turned back to their original state by Kendra, Silvestrus and two other rebels came back. Silvestrus then went with Targoron, Peredor, Seth, and the Sphinx to take back the Sands of Sanctity and the Oculus from Graulas and Nagi Luna. Silvestus heroicly fell when he managed to retrieve the secret artifacts and gave them to Targoron, who took them to safety.

Fablehaven book 5
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