What should i get my bf for christmas?

Me and my bf have been together for about 4 years.hes 18,He loves music like tool,five finger death punch,apc,2pac.etc. he likes playing video games like doom..? i think thats what its called.he loves working out,he likes movies...idk i need help lol. i need a guy around 18 years old to give me their advice.tell me what you would want your gf to get you for christmas?