Act as a seasoned fantasy writer with expertise in tragic hero arcs. Craft a detailed backstory for a knight who must embark on a quest to slay their own father. Describe the knight's [appearance], including scars or armor details that hint at their inner turmoil. Explain the [father's crime] that forced this fateful confrontation, weaving in elements of betrayal or dark magic. Outline the knight's [internal conflict]—how they grapple with duty, love, and vengeance. Include 1-2 key allies who either support or challenge their mission. The tone should be grim yet poetic, with vivid sensory details (e.g., the smell of rusted chains in the father's dungeon). End with the knight's final thought before drawing their sword.