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Despite the Imperium's best attempts to forestall the ork plague that is wrecking havoc in human space, an ork attack moon now hangs over Terra.

Despite the Imperium's best attempts to forestall the ork plague that is wrecking havoc in human space, an ork attack moon now hangs over Terra. As its malevolent presence gazes down at the Imperial Palace, terrified citizens run riot in the streets. In a last-ditch attempt to destroy the attack moon, a proletarian crusade is launched. Thousands of ships large and small head to the moon carrying billions of citizens, all eager to take the fight to the enemy. It seems the attack has a chance of success as the invasion force lands safely, but the orks have yet to spring their trap...

The Adeptus Astartes carry the battle to the orks' home world, led by a mighty armoured warrior of legend.

Tearing itself apart from within, the Imperium is still virtually powerless to resist the ork advance. When the Adeptus Mechanicus reveal they have discovered the orks' point of origin, the Adeptus Astartes start to gather their forces for a massive assault on their enemy's home world. But what the Imperial forces need is a figurehead, a hero from legend to lead them--a primarch. Meanwhile, on the planet Caldera, a mighty armoured warrior fights tirelessly against the orks--is he the saviour the Imperium seeks?

The attempt to hunt down and kill the orks' leader has ended in catastrophe. The Imperium is reeling from the loss of so many beloved heroes, and the military forces of mankind have been reduced to tatters. Koorland now knows that brute force is not the answer--but how else can the orks be fought? In a radical move, he creates small, mixed Chapter units of Adeptus Astartes--compact teams that will hit the enemy hard and fast, and with deadly accuracy. With armour painted the black of mourning, the new strike teams become known as the Deathwatch. But will this be enough to tip the balance, or does the Imperium need to discover other new means to defeat the orks?