The Shining Knight is an immortal warrior from Arthurian times who was a member of the Seven Soldiers of Victory and later, the Demon Knights.
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History
Thousands of years ago, in the time of Artus, the Bear King, there lived a young squire named Ystin with two spirits - one male, one female. When Camelot fell, young Ystin was impaled on a tree with a spear, and thus might have ended their story. However, the wizard Merlin intervened. Intrigued by Ystin's dual nature, Merlin revived them with a sip from the Holy Grail, granting them a measure of immortality before departing the battlefield. When Ystin came to, they remembered nothing of their encounter with Merlin, and so vowed to find those responsible for the fall of Camelot.