- Inquisitor Thrax, theone who aprehended Titus based on Leandros's accusation, was an Inquisitor with a grudge against Space Marines, seeing them as a liability to the Imperium. He was part of the Inquisition agents which declared Huron Blackheart and the Maelstrom Warders Excommunicate Traitoris during the Badab War. He had Titus tortured and intwrrogated for years, with no intention of ever letting him go, and would keep him in stasis after interrogations.
- Thrax died during an Inquisition operation against a traitor chapter. During the operation, he was possessed by a Chaos Daemon, and was purged by the Grey Knights.
- The Inquisition sent the Red Hunters to investigate Thrax's holdings, to make sure that him being possessed was just an i cident and not that he had been traitor this whole time. That's when the Red Hunters found Titus, as well as dozens of other Astartes who had been similarly imprisoned and tortured.
- The Inquisition transferred the recovered Astartes to the Deathwatch, allowing its Chaplains to be the ones to interrogate them and test their loyalty. Titus was found free from Chaos taint and disloyalty by the Deathwatch.
- Titus inquired about the Ultramarines, and the Deathwatch revealed to Titus that there were zero records of him ever serving the Ultramarines. Titus interpreted this to have been that he was censured as a disgrace to the chapter, so in grief he declared himself a Blackshield and joined the Deathwatch.
- Serving in the Deathwatch, him and his fellow Astartes were deployed against the Tyranids as part of the 4th Tyranic War. During one disastrous operation, Titus's company was fully wiped out, and Titus was gravely wounded after taking down a Carnifex. He was literally beyond saving, resigning himself to finally die in service of the Emperor.
- THE ULTRAMARINES 1ST COMPANY, LED BY CAPTAIN SEVERUS AGEMMAN AND CHIEF LIBRARIAN VARRO TIGURIUS, ARRIVED TO SAVE TITUS. During Warp travel, Tigurius felt the soul of an Ultramarine dying, and when he extended his extra-sensory perception, he recognized it was Titus. Agemman and Tigurius personally knew Titus from back when he was 2nd Company Captain. They immediately initiated a rescue operation for him. Titus was rescued at the nick of time, and to save his life, he was immediately taken into surgery to perform the Rubicon Primaris on him. Titus survived the operation and is now a Primaris Marine.
- Agemman and Tigurius reveal to Titus that FOR YEARS Marneus Calgar furiously protested against the Inquisition and demanded that Titus be released back to the Ultramarines. The reason Titus's name had been erased from the Ultramarines' records was not out of censure of Titus, but out of shame that the Chapter had so disastrously failed one of their own. Titus was never seen as a disgrace by Calgar or the high leadership of the Chapter.
- Titus is welcomed back to the Ultramarines with full honors, him having declared himself a Blackshield being fully disregarded and his service in the Deathwatch considered as faithfully serving the Ultramarines for all this time.
- As Cato Sicarious is currently serving as 2nd Company Captain with distinction, Titus is not given back his old position, but in deference to his service and loyalty, he is still given back officer rank as a Primaris Lieutenant.