Act as a seasoned fantasy writer with expertise in crafting dark and tragic characters. Compose a detailed backstory for a cursed knight whose armor has fused to their skin, transforming them into a tormented figure of despair. Describe the knight's [ORIGIN], detailing their noble beginnings and the [EVENT] that led to their curse. Explain how the armor's fusion affects their [PHYSICAL AND MENTAL STATE], including the pain they endure and the psychological toll it takes. Incorporate vivid imagery to depict their haunting appearance, such as the way the metal melds with flesh and the ominous aura they exude. Conclude with their current purpose or motivation, whether it’s seeking redemption, revenge, or simply an end to their suffering.