The Daemon Prince Mortarion emerged from the Eye of Terror at the head of a vast plague horde, intent on spreading corruption throughout the Imperium he once served faithfully. The Gray Knights, under the leadership of Supreme Grandmaster Geronitan, faced Mortarion's army on the plains of the planet Kornovin. Gray Knight forces were mobilized on a scale the likes of which the galaxy had never seen before. Kaldor Draigo and his loyal brotherhood grandmasters led a frontal attack, trusting in Geronitan's secret plan... until the Supreme Grandmaster was unexpectedly defeated by the Lord of Death himself. Under the watchful eye of the Inquisition, knowing that their mystical path of destiny has been interrupted, the Gray Knights must cast aside all thoughts of revenge for their commander. A new Supreme Grandmaster must be found or the battle will be lost.