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The current king of Roland who was friends with Ryner at the military academy.
Sion Astal was the illegitimate son of the former king of Roland who was born to a low-class commoner woman. In order to avoid embarassment, the king tossed both Sion and his mother out of the castle and forced them to live on the streets of the capital city instead. Throughout his childhood, Sion was often bullied by the other kids because of his bastard upbringing, but his mother encouraged him to focus on the fact that there would always be those who loved him, no matter how much others wanted him to suffer.
Eventually, his mother died and Sion himself was drafted into a special Roland military academy for malcontents and noble children who had shown promise with magical powers. It was there that he met Ryner, among other students, and became his friend when he saw the potential in him that others dismissed due to Ryner's lazy behavior. Sion told Ryner that he would one day become king of Roland and eliminate the need for war from the country, and then from the world. Ryner seemed reluctant to join at the time.
Later on, he was attacked by assassins sent by his rivals in the royal court, who discovered that he was of the royal bloodline and believed he could become a threat in the future. However, Sion was saved by members of the Eris family, the personal guardians of the king and incredibly skilled fighters. It was thanks to the work of Ferris and Lucile that he eventually became the King of Roland himself.
As for Ryner, it was thanks to him that Sion was able to survive an ambush of several magic knights from Estabul, and Sion was considered a hero throughout the land for saving Ryner, Kiefer, and himself. However, Sion knew that it was Ryner's "Alpha Stigma" power that saved them all, and he decided to study it in order to exploit its use for the battlefield in the future. Ryner himself was kept in a locked cage, partly out of his own will, for two years after that aforementioned battle. When Ryner's time was up, Sion ordered him to go with Ferris and search for artifacts that could be linked to the Legendary Hero from a long time ago.