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Leandros was the most recent member of [[Space Marine Captain|Captain]] [[Titus (Captain)|Titus]]'s [[Command Squad]]{{Fn|1}}, when he took part in defending [[Graia]], after it was [[Graia Invasion|invaded]] by [[Warboss]] [[Grimskull]]'s [[Waaagh!]]. However, the [[2nd Company (Ultramarines)|2nd Company]]'s fleet came under attack by the [[Orks]], when they arrived at the [[Forge World]] and Titus deployed them, while the Company was under fire.{{Fn|2a}}. This chaotic deployment led the Ultramarines to be separated, but Leandros soon regrouped with Titus and their fellow Ultramarine [[Sidonus]].{{Fn|2b}}. The three would fight beside [[Lieutenant (Imperial Guard)|2nd Lieutenant]] [[Mira]]'s [[203rd Cadian]] [[Regiment]] against the Orks{{Fn|2b}}, but Leandros thought little of the [[Guardsmen]]. His ascension to an Ultramarine had caused him to lose his [[Human]] perspective. Leandros was especially patronizing to the surviving Guardsmen he encountered on Graia.{{Fn|1}}. In the course of defending the [[Forge World]], with the Cadians, though, Titus' group crossed paths with [[Inquisitor]] [[Drogan]].{{Fn|2c}}

The [[Inquisitor]] was on [[Graia]] developing a weapon powered by the [[Warp]], called the [[Psychic Scourge]], and required their help in defending it. [[Titus (Captain)|Titus]], [[Sidonus]] and Leandros succeeded in saving the Scourge from the [[Orks]]{{Fn|2c}}, though in the process the Captain is forced to grab hold of the Scourge. This surprises [[Drogan]], as anyone who made physical contact with the weapon should be killed: the Scourge is powered by unstable Warp energies. Leandros notes this, suspicious as to how Titus was able to survive. The Captain states that he does not know, but orders them to move before the Orks attack again. Leandros reluctantly drops the matter,{{Fn|2d}} and the Ultramarines escort the weapon and Inquisitor to another base where it could be used. In doing so, [[Drogan]] hoped the weapon would defeat [[Grimskull]]'s invasion. However, when activated, it instead opened a [[Warp Rift]] above the [[Forge World]] and allowed the [[Sorcerer]] [[Nemeroth]]'s [[Chaos]] forces to invade Graia. It was revealed that [[Inquisitor]] Drogan had been slain before he made contact with Titus' group and had already been possessed by a [[Daemon]] serving Nemeroth. Before the three Ultramarines could be killed by Nemeroth, however, [[Warboss]] [[Grimskull]] attacked the [[Sorcerer]] and the Ultramarines were able to reclaim the Psychic Scourge.{{Fn|2e}}. Under Titus' orders, the group then used the [[psychic]] weapon to empower the [[Imperial Titan]] ''[[Invictus (Titan)|Invictus]]'', which fired upon the Warp Rift and weakened it. Afterward, Titus gave the Scourge to Sidonus and ordered the Veteran Sergeant to take it to their [[Strike Cruiser]] ''[[Fury of Descent]]'', for safekeeping. The Captain and Leandros kept Nemeroth's forces at bay, while Sidonus raced towards a landing pad to wait for an aircraft to evacuate him. However, when he reached it, Sidonus was killed by Nemeroth who teleported behind the Veteran Sergeant and impaled him with [[Lightning Claw]]s. Titus and Leandros saw this, but they were unable to save Sidonus before he was killed and Nemeroth escaped with the Psychic Scourge.{{Fn|2f}}

A vengeful [[Titus (Captain)|Titus]] then told Leandros to safeguard [[Sidonus]]' body until an [[Apothecary]] arrived and to then join the Imperial counter-attack. The [[Space Marine Captain|Captain]], however, planned to hunt down and kill [[Nemeroth]], before the [[Sorcerer]] could use the [[Psychic Scourge]]'s power to become a [[Daemon Prince]]. Leandros vehemently disagreed with this and stated Titus' course of action was suicide or worse. He explained that the Captain had shown repeated resistance to the [[Warp]] since Nemeroth had invaded [[Graia]]; a fact that the Sorcerer was aware of, interested in Titus' ability. Though Leandros denied fearing that Titus would fall to [[Heresy]], he believed that whatever was behind the Captain's resistance would only aid the Sorcerer. Titus disregards Leandros' concerns and insists that he will not embrace Heresy, before leaving to confront Nemeroth.{{Fn|2f}}.

However, Leandros' concerns led him to become convinced that Titus had become corrupted; contacting the [[Inquisition]], he claimed Titus was a [[Heretic]].{{Fn|2h}}. Meanwhile, the Captain succeeded in killing Nemeroth and closing the [[Warp Rift]]{{Fn|2g}} as more Imperial reinforcements arrived. Despite this, Leandros' charge against Titus led him to be taken into custody by [[Inquisitor]] [[Thrax]]. Before he was escorted away, Leandros told Titus that the [[Codex Astartes]] left no doubt; no one could go unscathed from contact with the Warp as Titus had. The Captain rebuffed him, saying that while the Codex was a set of rules that guided the Ultramarines, how they lived with those rules was the true test of a [[Space Marine]]: a test, Titus concluded, that Leandros had ultimately failed.{{Fn|2h}}