A terrifying, majestic, and visually striking skeletal demon emerging from a swirling vortex of dark, jagged energy, in the "Fiend-type" monster style of Kazuki Takahashi. The demon features an exposed, geometrically perfect ribcage, massive curved horns with jagged, bone-like textures, and leathery wings that look like tattered, sharp-edged capes. The art style uses aggressive, thorny, and tapering linework, where every bone, sinew, and claw is defined by sharp, needle-like strokes. The inking is exceptionally heavy and bold, with solid black shadows defining the deep hollows of the skull and the immense depth of the wings. The demon’s posture is one of primal, ancient power, with lightning-like dark energy crackling around its claws and horns. The background is a desolate, gothic landscape of jagged rocks, dark clouds, and ancient ruins. The mood is "demonic, majestic, and visually striking," blending classic horror with high-fantasy design.