A digital portrait of an undead knight standing in a dimly lit, ancient cathedral. Atmosphere of eerie mystique with intricate gothic architecture, reminiscent of Greg Rutkowski and Ferdinand Knab's styles. The knight is adorned in corroded yet elaborately ornate armor, illuminated by a dramatic play of light filtering through shattered stained glass windows. Vines and moss creep through crevices, enhancing the decay. Shadows dance across the floor, echoing the works of Rossdraws and Tom Bagshaw, while global illumination highlights the knight's hollow, glowing eyes, capturing an ambiance of haunting beauty and sorrow.