The Imperium’s situation has never been more grim an ork attack moon hangs over Terra, and ork armadas ravage human space. To make matters even worse, eldar strike at the heart of the Imperial Palace, forcing humanity’s defenders to fight on two fronts at once. Though it seems nothing can stop the orks neither brute force, science, nor faith an unlikely alliance in the furthest reaches of space uncovers the first clue how to defeat the greenskins. The Adeptus Astartes now face an almost impossible task: taking news of this discovery back to Terra through a galaxy teeming with orks.

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Mysteries abound as the eldar make their presence felt in the midst of humanity's war for survival. And fans of the Imperial Fists and Iron Warriors will be thrilled or appalled to see rivalries (sort of) put aside as loyalists and traitors work together against their common foe...