Sicarius

Biodata

Feature	Information
Name	Cato Sicarius (西卡琉斯)
Alias(es)	Sicarius; Knight of Macragge; Duke of Talassar 413
Species/Race	Adeptus Astartes (Space Marine)
Gender	Male
Affiliation	Ultramarines; Ultramarines Second Company; allied with the Death Seekers Legion
Occupation/Role	Captain of the Ultramarines Second Company 263 264
Status	Active 414
First Appearance	Chapter 166

Background / History

Sicarius deployed to Pedetia as a sergeant of the Ultramarines' Eighth Company. While his Thunderhawk descended, he calmly prepared for combat and discussed Pedetia's unusual culture with Sergeant Numin; he was unaware that the Death Seekers already regarded him as a legendary figure 166.

After surviving a Thunderhawk crash during a T'au ambush, Sicarius immediately entered combat. His actions included an extraordinary aerial interception that destroyed a T'au bomber and demoralized the T'au command structure 167 169.

The Death Seekers' intense admiration initially unsettled him. He believed their praise exceeded his achievements and feared accepting glory that he had not earned. Marneus Calgar instead directed him to work alongside the Death Seekers in the coming defense of Macragge, telling him to become worthy of the honor through his actions 174.

On Macragge, Sicarius helped contain Genestealer infiltration at Shirok Starport. He ordered a lockdown and civilian inspections, then openly credited Governor Ruan Wenbo rather than claiming credit for discovering the infiltrators himself 187 188.

Following the near-destruction of the Ultramarines First Company, Calgar elevated Severus Agman to lead the First Company and appointed Sicarius as Second Company Commander. Sicarius accepted the post immediately and planned an aggressive raid against the Tyranids on Plantem 263 264.

Appearance

Sicarius is a tall Ultramarine with a handsome yet resolute face. He is commonly depicted in cobalt-blue Power Armour, projecting confidence and formal Astartes discipline even when surrounded by mortal allies 166 404.

• Often wears a helmet fitted with a vox-amplifier during combat operations 166 188.
• Uses Master-crafted Power Armour as Captain of the Second Company 404.
• Carries a Power Sword and Plasma Pistol in personal combat 407.
• His breastplate was deeply damaged by Typhus's Manreaper, but the wound did not prevent him from continuing the battle 414.

Personality

Sicarius is proud, disciplined, and deeply committed to Ultramarines honor. He expects himself to earn recognition through service rather than accept praise he believes he does not deserve 174. He also places great value on protecting Imperial civilians and mortal allies, refusing to abandon defenders who had previously fought beside him 410.

Though he respects the Codex Astartes, Sicarius can act impulsively when faced with an opportunity for decisive victory. His Plantem offensive expanded far beyond its original scope, yet he continued adapting his strategy as conditions changed 268 269. After failing to kill Typhus behind enemy lines, he candidly admitted the mission's failure and proposed using the Second Company as a mobile reserve 409.

His adherence to purity and doctrine has limits in practical warfare. When Death Seekers transformed into Chaos Spawn while attacking Typhus, Sicarius refused to cooperate with them despite the tactical opening, regarding them as abominations 408.

Abilities & Skills

Astartes Physiology and Resilience

Sicarius possesses the strength, speed, and endurance of an Adeptus Astartes.

• Survived a violent Thunderhawk crash and entered battle immediately afterward 167.
• Recovered from severe burns, exposed bone, and damaged armour caused by the Norn Emissary's death explosion 264.
• Continued fighting after Typhus's Manreaper carved a deep gash across his breastplate 414.

Swordsmanship

Sicarius is an exceptionally skilled Power Sword duelist, using speed and precision to offset stronger opponents.

• Avoided Typhus's direct attacks instead of attempting to contest the Death Guard First Captain's superior strength 407.
• Used a point-blank Plasma Pistol shot to disrupt Manreaper's trajectory, then exploited Typhus's exposed guard 407.
• Delivered a rapid sword sequence that cut through a weak joint in Typhus's armour and severely wounded his right arm 407.
• Consistently targeted gaps in Typhus's Terminator Armour during their later duel 414.
• Limit: Typhus's armour, Destroyer Hive, and attritional advantage prevented Sicarius from securing a decisive kill 407 414.

Tactical Command

As Second Company Captain, Sicarius combines aggressive initiative with battlefield adaptability.

• Organized the Plantem assault, using a large frontal offensive to distract the Tyranids while leading the Second Company in a stealthy airborne strike on their core 266.
• Ordered the destruction of Tyranid node creatures and biomass pools, then continued the operation when a Death Seeker Chimera opened a breach for reinforcements 268 269.
• Deduced that the Death Guard's corpse tide depended on a “Witchcraft Core” and led a deep strike to locate and destroy its source 404 406.
• Abandoned an attempted counterattack amid the Chaos Spawn incident, prioritizing an orderly withdrawal of his wounded troops 409.
• Personally committed the Second Company to defend a vital hub connecting Pedetia's eastern and western defensive lines 410.

Leadership and Morale

Sicarius inspires both Space Marines and Death Seekers through direct action, clarity of purpose, and personal presence.

• Rallied Ultramarines, allied Chapters, and Death Seekers before the Plantem offensive 266.
• Defended Death Seeker officers' use of ambition and glory to motivate their soldiers instead of coercion 406.
• Redirected Death Seekers' excitement over his autograph toward their essential corpse-incineration duties, improving their morale and focus 410.
• His reputation among the Death Seekers is so extensive that his arrival or promotion regularly triggers celebrations and autograph requests 166 174 263.

Equipment

• Master-crafted Power Armour — Enhances his combat strength and endurance; equipped with external vox systems 404.
• Power Sword — Primary melee weapon, equipped with a Disintegration Field 407 414.
• Plasma Pistol — Used at point-blank range to disrupt Typhus's Manreaper and create an opening 407.
• Bolter — Used during the T'au deployment and subsequent ground fighting 166 167.
• Jump Pack — Used during the Second Company's vertical assault on the Tyranid Hive and later aerial battlefield strikes 268 413.

Relationships

• Marneus Calgar — Chapter Master and mentor figure. Calgar entrusted Sicarius with responsibility for the Death Seekers' Ultramar alliance and later appointed him Second Company Commander 174 263.
• Sergeant Numin — Fellow Ultramarine and trusted subordinate. Numin questions Sicarius's risks but follows his orders during the Plantem operations 166 268 269.
• Severus Agman — Former Second Company Commander. Agman supported Sicarius's promotion and entrusted the Second Company's honor to him 264.
• Ruan Wenbo — Governor of Pedetia and allied leader. Sicarius worked with him during the Genestealer purge and guided him through the Fortress of Hera 187 188 190.
• Death Seekers Legion — Allied mortal force whose members idolize Sicarius, often seeking his autograph or treating his battles as historic events 166 174 410.
• Typhus — Death Guard First Captain and Sicarius's primary rival during the defense of Pedetia. Sicarius wounded him in two separate engagements but could not kill him 407 414.

Story Role / Major Arcs

Pedetia and the T'au Campaign

Sicarius arrived on Pedetia with the Ultramarines, survived the T'au ambush, and helped reinforce the Death Seekers Legion. His aerial interception of a T'au bomber became a major blow to enemy morale 166 167 169.

Macragge Genestealer Purge

While receiving Ruan Wenbo at Shirok Starport, Sicarius responded decisively to the Genestealer threat. He imposed a lockdown, coordinated with the Ultramar Auxilia, and acknowledged Ruan's role in identifying the infiltrators 187 188.

Plantem Tyranid War

Promoted to command the Second Company after the First Company's losses, Sicarius launched a high-risk assault on a Tyranid bio-nest. His unorthodox offensive helped fracture Tyranid defenses and contributed to the Imperial counteroffensive on Plantem 263 264 266 269.

Death Guard Assault on Pedetia

Sicarius returned to Pedetia with the Second Company to oppose Typhus and the Death Guard. He led an infiltration strike against the Plague Engine, fought Typhus directly, and later committed his company to the defense of a critical hub during the full-scale Death Guard offensive 404 406 410 413 414.

Notable Quotes

“Rejoice, traitor—your redemption has arrived! Today, I, Cato Sicarius, grant you your only absolution: death!” 407

“The Ultramarines are not incapable of fighting merely because there are no mortals to bear the casualties.” 404

“Then I will hold here with you. Just as you did on Plantem, the Ultramarines will never abandon their allies.” 410

“I am Cato Sicarius! Captain of the Ultramarines' Second Company, Knight of Macragge, Duke of Talassar!” 413