A pixel art depicting a full-body medieval knight clad in a gleaming blue metallic armor, showing intricate engravings of battles and mystical symbols. The armor is slightly tarnished in places, hinting at past defeats. The knight stands tall, holding a massive, weathered longsword with a cracked blade, its hilt adorned with faded gold accents. His stance exudes strength and resilience, yet his posture is slightly slumped, conveying the weight of failure. The knight's helmet visor is open, revealing a weary face with deep scars and sorrowful eyes, as if burdened by the memories of a lost cause. The background depicts a dim battlefield shrouded in mist, with broken banners and shattered shields scattered around, enhancing the tragic aura of the scene. The pixel art should capture the fine details of his armor, sword, and expression, emphasizing both his heroism and his downfall.