Act as a seasoned fantasy character artist with 10+ years of experience in designing dark and intricate RPG characters. Create a detailed sketch of a rogue wielding a cursed weapon. The rogue should have a [sinister aura], with [tattered, shadowy clothing] that hints at their stealthy nature. The cursed weapon should be a [serpentine dagger] that emits a faint, eerie glow, with intricate runes carved along its blade. Pay special attention to the rogue's [piercing, haunted eyes] and the way the weapon's curse subtly affects their posture, as if it's slowly consuming them. Include subtle details like scars or tattoos that tell a story of their dark past. The overall composition should evoke a sense of danger and mystery.