Create an original high-detail 3D full-head royal helmet for a game avatar. Style: elite, luxury, high-status. Shape: fully enclosed helmet covering the entire head, smooth rounded shell with layered segmented panels and a refined visor or mask plate. NO spikes, NO horns, NO sharp crown points, NO V shapes. Details: central gem crest or thin halo ring, clean symmetrical geometry. Materials: matte black obsidian metal with brushed gold trim. Accents: subtle emissive violet glow. Game-ready, optimized topology, wearable head accessory.