“Doctor, Osiris will deploy within the hour. Have your plan ready.”
Necessity makes for strange bedfellows, or so the saying goes. It wasn’t long ago that Jameson Locke, Agent of ONI, volunteered to assassinate the Arbiter. Now, UNSC Spartan Locke has risked life and limb to liberate the Arbiter from the Covenant’s vile clutches. Locke’s motives were not entirely selfless, however: The Spartans need the Arbiter’s help in storming Sunaion, the last Covenant stronghold on Sanghelios. A Guardian is believed to be located at Sunaion, and Osiris needs to reach it to track down the Chief.
The Guardians’ awakening threatens the safety of the galaxy, and it’s clear that the Master Chief and Cortana are somehow involved. The final Guardian resides at Sunaion, but so do the remnants of the Covenant’s forces on Sanghelios. You can’t storm Sunaion without the Arbiter’s help, but the Swords are still preparing for war. Report in with Dr. Halsey to plan your next move.