From Dust Storm:
After releasing the Didact, you are faced with the UNSC Infinity crash landing on Requiem. You must make your way through the jungle, meet up with other Marines and Spartans along the way, and defend Infinity while repairs are being made, but you must hurry: you’re not the only one heading towards Infinity. Also, you get to drive a Scorpion tank. Helping us run through one of the toughest Halo 4 missions is the mythical man himself, Mythic Tyrant, founder of the mythic community. Enjoy!