Design a 3D humanoid character in A-pose or T-pose. No cape or cloak. The entity, named Nullborne, is a fusion of ancient flesh and decaying cybernetics. Its skin is pale grey, etched with sorrowful runes and corroded implants. Tubes pierce through bone, glowing dimly with lost energy. A cracked mask covers a face that no longer remembers itself. Grim dark fantasy meets sci-fi—focus on melancholy, stillness, and faded purpose