Ghost: Seems like the Cryptarchs are really curious about this region of Mars.

Master Rahool: For Years the Cryptarchs have been waiting to break through the Exclusion Zone and find what's left in that buried city. They say Freehold birthed technological wonders. We cannot let the Cabal destroy it.

The Barrens, Meridian Bay, Mars

Ghost: The Cabal could have levelled that entire city. If they haven't brought it down yet, they must have found something valuable. We should track them. See what they're after.

The Hollows, Meridian Bay, Mars

Ghost: I'll Scan for Cabal transmissions. I've got something. Inside building 5. There's an Active feed back to their base here. Let me listen.

Ghost scans transmissions

Ghost: Looks like the Cabal have a recon team stationed at the top of the other skyscraper here. They must have found something interesting. Let's check it out.

Guardians enters the Skyscraper at Dust Palace

Ghost: Clovis Bray. A center for scientific advancement, interplanetary defense, AI development, research on the Traveler. This place could be a gold mine.

Guardian fights off Cabal, ascends the skyscraper

The Vex engage the Cabal

Guardian engages the Cabal at the Overwatch

Ghost: This machine! It's still active! Let me analyze it.

Ghost analyzes ancient machine

Ghost: This AI once connected to the Warmind of Mars.

Rasputin: Soul does not exist. Death does not exist. Virtue does not exist. Everything is allowed.

Ghost: Rasputin's controlling it. I can't get in and neither could the Cabal. He's everywhere now.