A UNSC cruiser activates a dormant Relay, forcing the politically divided UNSC into a new war against the Reaper menace. This time, Humanity will not stand alone. Now surrounded by diplomatic adversaries and renegade rivals and contenders, Humanity will face a new set of challenges unlike anything it has seen before. The Reclamation has already begun, and we are hopless to stop it.

The humans finally pulled it off. Finally, they figured out how to break Einstein's speed limit. Unfortunately, when the test probes go AWOL, the humans scramble to find out where in the vast universe they wound up. However, someone else already did...

Koprulu sector is a brutal place and anyone living in it has a story to tell, be it Marines, ship captains or Ghosts, there is no such thing a routine in these people's lives. This story follows Henry Navarro-Jackson and many others as they fight for what they believe in, be it duty, truth or sheer psychotic fun.

On Krieg you are born with sins already weighing you down and the only way to redeem yourself is death in the Emperors service. A young Krieg nobleman joins the Korps, not to atone, but for revenge.

The Great Wars are over. Jim Raynor and his men have left the Koprulu Sector behind, choosing to settle a world away from that sector of space. Unfortunately, the colony of Shanxi is not safe; hostile aliens have invaded, intent on controlling the Terrans and their bizarre technology. Unfortunately for the Turians, the Terrans have experience fighting hostile alien invaders.

Lured away from her research on the protheans, young archaeologist Liara T'Soni joins an expedition to an unexplored part of space. There, a ruined world and a derelict ship hold secrets that may explain the cause of the prothean extinction or may be the harbinger of their own.