The Abyssal Mask is a mystical headpiece with a dark, otherworldly aesthetic, featuring a smooth, curved surface that resembles polished obsidian with deep purple and black hues. Its form is asymmetrical, with one side extending into a sharp, horn-like protrusion, while the other side is adorned with intricate, glowing violet runes that pulse with energy. The mask covers the upper face, leaving the mouth exposed, and is designed to appear as if it's seamlessly merging with the wearer's skin, giving it an organic yet sinister look.