Fresh from the war against the Reapers, the Master Chief, Cortana, Teana, and Commander Shepard investigate rumors of activity from the Covenant terrorist faction led by the anti-human Sangheili kaidon Jul Mdama. Following the intel, the quartet stumbles upon a Forerunner artificial world with an ancient secret buried within. But some secrets are better left buried...

Returning to headquarters from unadministered world #97, the Time-Space Administration Bureau cruiser Arthra finds itself in the middle of a war, over a strange ring-shaped world...

First part excluding prologue of an epic mega-xover. Disillusioned by the TSAB, Teana sets off to explore other realms. Her first stop puts her in the middle of the devastating Human-Covenant War. Rated M for graphic violence and strong language.