Design a high-quality Spartan helmet with a sleek, metallic finish, featuring a prominent crest and detailed engravings. The helmet should fit a Meta Horizon Worlds avatar, with adjustable straps for a secure fit. Combine historical authenticity with modern flair, using lightweight materials for comfort. Ensure the visor provides clear visibility while maintaining the iconic Spartan look with bold, angular lines. The model should be detailed and polished for a realistic appearance.