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Nine years later, he became a full-fledged Marine in the [[Scout Company]], and was finally inducted into the Fourth Company in 909.M41. During his training, he discovered he had a natural talent for war and swore to become the best warrior Macragge had ever seen.{{Fn|4x}}

He rose gradually to become a [[Veteran Sergeant]] of the Fourth, under Captain [[Idaeus]].{{Fn|1}}

Shortly thereafter, Ventris was confirmed as the new Captain of Fourth Company by [[Chapter Master]] [[Marneus Calgar]]. His first mission as Captain was to put down a rebellion on the [[Imperial]] world of [[Pavonis]].{{Fn|2a}} It was on this mission that the Ultramarines encountered the [[Night Bringer]], newly awakened from its millennia-long slumber.{{Fn|2x}}

:{{main|Battle of Tarsis Ultra}}

During a boarding action of the [[space hulk]] ''[[Death of Virtue]]'', Ventris and the Fourth were attacked by hordes of [[genestealers]]. [[Astropaths]] aboard the [[Strike Cruiser]] ''[[Vae Victus]]'' detected psychic disturbances from a [[Tyranid]] [[Hive Fleet]] (a tendril of [[Leviathan]]) moving towards [[Tarsis Ultra]].{{Fn|3}}{{Fn|4a}}

Ventris, Pasanius, and the Deathwatch team managed to finally kill the last Norn-Queen with Kryptman's gene-poison. However, at the last moment Ventris himself was poisoned by the Norn-Queen, causing his entire bloodstream to clot within his body. He would have died but for a full blood transfusion contributed by Pasanius, which kept him alive until they got him medical care on Tarsis Ultra. The remaining Space Marine contingent of both the Ultramarines and Mortifactors were down to sixteen men when the Tyranids started to attack each other, as the link with the [[Hive Mind]] was lost when the last Norn-Queen died. The psychic shockwave of the overmind's death affected the Tyranids into slaughtering each other senselessly, leaving the Imperials alone. The majority froze to death under the harsh conditions of Tarsis Ultra with a minority surviving and taking refuge in warmer surroundings. At the conclusion of the war, Ventris reaffirmed his faith as an Ultramarine to protect the [[Imperium]] from the enemies of [[Mankind]].{{Fn|4x}}

Despite Ventris's sincere belief that his actions had been correct, Learchus reported his and Pasanius's breaches of the Codex to Chapter command. Ventris and Pasanius were both arrested and placed on trial. Based on some discreet advice from Lord Calgar (passed along by [[First Captain]] [[Agemman]]), Ventris and Pasanius waived their rights to defend themselves, so as to prevent their example from being followed by others and causing anarchy in the Ultramarines.{{Fn|6}}

Ventris and Pasanius left Macragge on a vessel, as the [[Imperial Guard Regiment]] aboard, the [[Macragge 808th]], was bound to fight against the [[13th Black Crusade]] in the [[Segmentum Obscurus]].{{Fn|7}}

During transit in the [[Warp]], the ship's [[Geller Field]] inexplicably failed, and all those within the ship perished, except for Ventris and Pasanius. A [[daemon]] known as the [[Omphalos Daemonium]] appeared, and overpowered the Ultramarines, taking them captive on board his [[Daemon Engine]]. They were transported to the [[Iron Warriors]] homeworld, [[Medrengard]], and charged with the task of retrieving the [[Heart of Blood]] from the fortress of [[Khalan-Ghol]]. Threatened with the annihilation of Macragge and [[Ultramar]], Ventris complied with the Omphalos's demands. However, after the daemon departed, Ventris assured Pasanius that he would not honour the pact, and instead would destroy the Heart of Blood.{{Fn|7}}

During the battle between the two daemons, Ventris and Pasanius made their escape, and Leonid sacrificed himself to prevent the [[Sarcomata]] from stopping them. However, the Ultramarines were cornered by Honsou and his retinue who outnumbered them. At the very last moment, the Unfleshed saved them by attacking and killing the whole retinue; Ventris managed to shoot Honsou, wounding him. At the point of being defeated, the Heart of Blood conjured up a bloodstorm which killed all nearby, including the daemonculabula.{{Fn|7}} Having been strengthened by the bloodstorm, the daemon went on to defeat Omphalos Daemonium, and collapsed out of exhaustion in the aftermath. The Ultramarines' final action at Medrengard was to board with the Unfleshed, upon the Daemon Engine left behind by the Omphalos Daemonium, to escape imprisonment beneath the fortress.{{Fn|7}}

After departing the [[Eye of Terror]], Ventris and Pasanius arrived on the troubled planet of [[Salinas]]. Here, they established contact with Imperial forces, and were taken to the Imperial fortress to await judgement. The [[Imperial Guard]] stationed on Salinas had become corrupt and debased, having killed thousands of innocent civilians just to get to the rebel leader. As such, the remaining rebels constantly attacked the Imperial Guard whenever they could, turning Ventris and Pasanius into prime targets. While there, the Unfleshed were quickly possessed by the souls of those killed, and they turned on the Imperial Guard stationed on the planet. Having detected a strong Warp influence on the planet, a detachment of [[Grey Knights]] was sent to investigate. They captured Ventris and Pasanius and held trials to determine their loyalty to the Emperor. After passing the trials, Ventris, Pasanius, and the Grey Knights were sent to kill the Unfleshed. After incurring terrible losses, the Grey Knights returned the two to Macragge.{{Fn|8}}

In early [[M42]], a scarred and aged Ventris reappeared, once again leading the 4th Company during the return of [[Roboute Guilliman]]. Ventris journeyed to the ''[[Macragge's Honour]]'' personally to tell Guilliman of [[Mortarion]]'s [[Plague Wars|invasion of Ultramar]].{{Fn|9}}