Typhus - A Legion Reborn: After being instructed that the time was right by the Dark Apostle Erebus of the Word Bearers, Typhon and his forces rejoined Mortarion's fleet during the purging of the Loyalist world of Ynyx. Disappointed that Mortarion had still not yet embraced the service of Chaos like most of his brothers, Typhon initiated a final scheme that would force the Deathlord to accept the truth of his Legion's damnation.Typhon had seen to it that the XIV Legion fleet's Navigators were killed to a man by his Grave Warden Terminators, claiming that he had caught evidence of their communications with Malcador the Sigillite in a plot to destroy the Death Guard fleet by leading it astray in the Warp, but reassured Mortarion that the psychic Warp-gift he himself possessed would see them through their journey in the Empyrean safe enough.Though he hated the concept of relying on witchery, Mortarion was left with little choice. The Death Guard fleet made transition into the Warp, and in the process damned themselves to an eternity of war as the puppets of a foul and ancient god.In leading the Death Guard into the Warp, Typhon had knowingly delivered them into the clutches of his new master, Nurgle, the Lord of Decay. The strange tides of the Empyrean are notoriously fickle, and during their voyage the entire Death Guard fleet was becalmed. As their warships lingered, directionless and without hope, the cloying influence of Grandfather Nurgle began to take hold.The Death Guard were subjected to the terrible infection of the Destroyer Plague and Nurgle's Rot, as Nurgle's power managed to infiltrate the vessels of the XIV Legion. It polluted the vessels themselves as easily as it did the warriors within. Before long, fat devil-flies buzzed through the thickening miasma inside each warship. Where they bit at the desperate warriors trapped within, flesh turned to suppurating jelly.The Daemon-venom of their stings caused mortal flesh to blossom into hard new growths. Bellies distended and eyes ran like cracked eggs; even power armour melded and flowed into strange new shapes. Here, the superhuman resilience of the Death Guard to disease and toxins proved their enemy, for they could not simply die, nor were they allowed to do so by the Plague Lord. Instead, they were slowly, sickeningly transformed into Plague Marines, their souls claimed by Nurgle in exchange for a permanent release from their pain.Enraged at the trap he now realised Typhon had led them into, Mortarion himself confronted his former friend aboard the Terminus Est. Typhon expressed his desire for Mortarion to accept the embrace of Nurgle as his true father, but instead the primarch physically assaulted his first captain, disgusted by his betrayal and embrace of the witchery he had long abhorred.Typhon's psychic abilities allowed him to hold off the primarch's attacks for a time, however Mortarion eventually prevailed and struck down Typhon with his scythe. Due to the Destroyer Plague permeating the vessel, Typhon was infused with the energies of Nurgle and was quickly resurrected by his divine patron. Yet Mortarion then revealed his trump card: he had long been keeping the deformed first Plague Marine and Nurglish Daemon Prince Ignatius Grulgor imprisoned, who he now released to carry out his vengeance.Grulgor strangled Typhon to death, fulfilling his oath to Mortarion to kill the first captain who had been responsible for his own first death upon the Eisenstein. However Typhon quickly came back to life once more, and both the first captain and Daemon Prince laughed as Mortarion realised he had been betrayed by both servants of Nurgle. As a reward for his service to the Lord of Flies, Grulgor's Daemonic essence dissolved and merged with Typhon's body, becoming the vector by which Calas Typhon would be transformed into Typhus, Champion of Nurgle.Typhon, having orchestrated this grand corruption, was rewarded most of all as Grulgor's essence entered into him. Swelling in size, his skin and armour became one. Great funnels of pestilential bone burst from his body. Into these poured thousands of Nurgle's Daemon-flies, gnawing him from the inside out until his rotten shell teemed and heaved with squirming life.Typhon became a great hollow colony of disease-carrying, supernatural insects. The bone funnels that sprouted from his back coughed black decay as Nurgle's servants regurgitated the psychic energies pulsing through what was left of his herald's body. Typhus, Host of the Destroyer Hive, had been born, most blessed and most cursed of all his now-repugnant kin.