Imagine an ultra-detailed oil painting that thrusts you into the heart of a surreal, dark fantasy dreamscape, masterfully rendered in the iconic style of Frank Frazetta. At the center of this apocalyptic hellscape stands a formidable, muscular figure, shrouded in a dark hood, with enormous black wings unfurled menacingly. His demonic plate armor, intricately designed and exuding malevolence, catches the faint, eerie light. His face, a dark void shrouded in shadow, is featureless except for two fiery red eyes that burn with an infernal intensity. He is engaged in a ferocious battle against a horde of demonic beasts that swarm in from all sides. Each beast, a grotesque amalgamation of nightmare and flesh, falls before the sweeping arcs of his massive, gleaming sword, wielded with a master's precision. In the background, jagged mountains rise ominously, silhouetted against a tempestuous, roiling sky. The ground is a macabre tapestry of decapitated demons, scattered skulls, and winding rivers of blood, completing this nightmarish vista with a visceral sense of dread and awe.