Create a highly detailed HDR fantasy image portraying a formidable warrior in epic steel-leather asinine arabic armor kneeling solemnly beside a grave. The warrior is depicted as a hooded figure leaning on a sword, while a misty and ethereal atmosphere envelops the scene. The background features a dark, stormy sky illuminated by lightning bolts, enhancing the dramatic ambiance. Aim for a realistic 8k concept art image with meticulous attention to detail, and provide the output in RAW format.