Verdun - Swordsman of the Sixth Era

In a time when men began turning their backs on their former allies, the dragons, one knight stood to defend his wyrm companion against a mob of bloodthirsty priests.... the knight eventually succumbed to his wounds and passed in the embrace of the one he swore to defend. To honor this sacrifice, the dragon breathed white-hot flames over his friend, transforming the body's remaining aether into a crimson jewel which he then affixed to the knight's blade (Encyclopedia Eorzea)