Anakin Skywalker and the 501st are tasked with intercepting a Separatist warship to get a hold of a top secret device when everything goes wrong.

Pvt. Alex Stalin is heading back to his homeworld of Reach when a new threat appears. It is not the Covenant, the Flood, or even the Forerunners. It's something that the Precursors envisioned in their final days. A terrible evil that would be unstoppable to any lone race.