Operation C: Monolith is the third operation of Halo: Spartan Assault.
Missions
Transcript
Even through the battle was going in the Spartan's favor, Draetheus V had a surprise in store.
Its moon wasn't a moon at all. It was a Forerunner creation, designed to build and destroy entire planets.
Nobody knew about this... until the Covenant cult leader found a way to reactivate the old Forerunner tech... and start disassembling Draetheus-V. It was Spartan Davis'sjob to shut down the device.