The Bloodlust Sigil is a dark, ominous symbol carved into a small, irregularly shaped piece of bone. The sigil itself is a complex, swirling design that seems to pulse with a faint red glow, suggesting a malevolent energy. The bone fragment has a rough, weathered texture, with visible cracks and grooves that add to its eerie, ancient appearance. The edges are jagged, as if broken from a larger piece, and the surface is slightly stained with dark, dried blood.