Create a design featuring a large, menacing creature with elongated claws and bat-like wings. The creature should have a skeletal structure with glowing eyes and a fierce expression. Below it, depict a snarling, mythical beast head, set against a background of swirling, abstract patterns. Replace the original patterns with jagged geometrical shapes and incorporate a scythe that transforms into twisted vine-like elements. Use a monochromatic color scheme with shades of grey to maintain an ominous tone.