The Scarus Sector is an Imperial Sector of the Segmentum Obscurus that is close to the Eye of Terror and is also adjacent to the Calixis Sector. The Scarus Sector has long served as the primary theatre of operations for the renowned Inquisitors Gregor Eisenhorn and Gideon Ravenor. It was also the site of the protracted Siege of Vraks from 813.M41 until 830.M41.


Scarus Sector Map

Modern Departmento Cartographicae Map of the Scarus Sector, ca. 999.M41

Scarus Sector

Archaic Departmento Cartographicae map detailing the Scarus Sector, ca. 402.M41

The Scarus Sector was discovered during the middle years of the Great Crusade in the late 30th Millennium. It was named for Captain Scarus of the Word Bearers Space Marine Legion's 52nd Company, whose Strike Cruiser Shield of Scarus and two other vessels were lost during a savage Warp Storm that occurred during the XVII Legion's sojourn in the Eye of Terror, during the quest now known as the Pilgrimage of Lorgar some forty standard years before the outbreak of the Horus Heresy. The Scarus Sector's capital is the Hive World of Eustis Majorus. The Scarus Sector borders the Calixis Sector to spinward and its known Sub-sectors include Angelus, Antimar, Helican, Kerak and Ophidian. This sector is the theatre of operation for the renowned Inquisitors Gregor Eisenhorn and Gideon Ravenor. The Helican Sub-sector was the site of the Helican Schism, a wave of rebellion, terrorism and sabotage that swept the region in the early 41st Millennium. The Ophidian Sub-sector is noted for being the site of the Ophidian Campaign (also known as the Purge Campaign), in which Battlefleet Scarus wrested control of the Sub-sector from Heretic forces. The campaign lasted from 240.M41 until 338.M41 -- and the Imperial victory represented a considerable achievement on such a short timescale. Lately, the Scarus Sector has been plagued by invasions of Orks, who attacked en masse during the 13th Black Crusade, a campaign led from the Eye of Terror by Abaddon the Despoiler himself, and Greenskin infestation remains a very real problem in this corner of the Imperium of Man.

13th Black Crusade

In 999.M41, war came without warning to the Scarus Sector, and the opening moves by the Forces of Chaos saw large number of plague-ridden Space Hulks entering Imperial space. Though many were intercepted by the Space Marines and destroyed, some managed to escape the Astartes' attention. Some of these foul vessels of contagion found their way into the Belis Corona Sector, spreading their disease and pestilence amongst the masses throughout the sector. Along with the adjacent Agripinaa Sector, they were some of the first to bear witness to the rise of hordes of infectious, undead zombies that threatened billions of people on many of the Imperial worlds within the sector. This plague was later named the Curse of Unbelief.

While the defence of the Cadian Gate from the Forces of Chaos continued to go badly upon the surface of many worlds in the Cadia System, in particular Saint Josmane's Hope and Solar Mariatus, the war in space was fought more on the Imperium's terms. The Cadia System had been the focus of Abaddon's primary fleet actions, and the Imperium's fortunes there changed from day to day. The situation was highly fluid and the Chaotic naval forces found themselves stretched to exploit the victories they had won.

A fleet the size of which has not been seen since the end of the Gothic War eight standard centuries earlier had been dispatched from Cypra Mundi, and arrived at the world of Belis Corona in preparation for a massive Imperial counter-offensive into the Cadian Gate. The arrival of this vast armada allowed those Imperial vessels that had been fighting continuously since the beginning of the invasion a brief respite. Severely depleted ship’s companies were bolstered through indiscriminate press-ganging, and hasty repairs and refits were undertaken on those vessels most in need of them.

The Imperial reinforcements were split into battlegroups, each tasked with bolstering the defences in a specific sector of the Segmentum Obscurus. The regions around the Eye of Terror encompass many millions of cubic light years, and only by the concentrated application of resources in those areas in most desperate need could the Imperial Navy hope to make inroads and slow, stall, and eventually repel the Chaos warfleets plaguing the region. A small number of Imperial Navy ships won a decisive victory when they managed to hold back a larger Chaos Fleet at the Ilthirium Belt, buying time for Battlefleet Agripinaa to arrive and allow the remaining ships to retreat. This course of action however, left the Agripinaa Sector open to invasion and soon the worlds of this sector and the Belis Corona Sub-Sector was transformed into nightmarish realms of plague and pestilence.

With Warp Storms rendering Astropathic communications erratic, the Segmentum Obscuras High Command continued to experience enormous difficulties coordinating command and control of its forces. Communications from the more distant sectors was particularly affected, and Imperial Commanders were advised that those communications they did receive from distant sources were not to be trusted, due to psychodynamic distortion. A particularly implausible report from the Scarus Sector indicated that in addition to Chaos attacks, the defenders there faced the menace of the Orks. After action reports cited Mordax Prime as the initial focus of a massive Ork incursion which occurred at the same time as the Chaos assault was first hitting the Segmentum, and if this were just an isolated case High Command would normally have written off the communication as misinformation caused by inexperienced troops facing an enemy they had no experience with. However, every major star system in the Scarus Sector soon logged similar reports, so they had to be taken seriously until more detailed information was forthcoming.

Abaddon had recruited massed warbands of Orks to act as mercenary auxilia to his Chaos Space Marine Legions during his 13th Black Crusade. Following up on terror raids and cunning feints by the Night Lords and Alpha Legion Traitor Legions many of the Orks banded together into ever-growing tribes that declared themselves as part of the "Green Krusade" (or Kroosade in some sources -- Ork spelling is always a matter of conjecture) in imitation of the grand assault of Chaos. The unstoppable force of the Green Kroosade inundated the Scarus Sector (Skar-Uz to the Orks). The Orks continued putting intolerable pressure on a number of worlds in the Scarus Sector, notably Lethe II and Mordax. The Magi Biologus of the Adeptus Mechanicus believed these foul creatures to be working alongside Abaddon the Despoiler to further their own ends, though they did not consider it to be a true alliance as such. More likely the Orks were taking advantage of the opportunity provided by the Despoiler's invasion to launch new attacks against distracted Imperial targets.

The situation on these worlds was grim indeed. In particular, Mordax Prime could not be allowed to fall into Greenskin hands, for it was a Forge World of prodigious output and its loss would damage the Imperium's war effort. More to the point, the Imperial forces dreaded the monstrosities the Orks might turn the production lines of Mordax Prime to creating. Fifteen Imperial Guard Army Groups and 5 legions of cybernetic Adeptus Mechanicus Skitarii troops continued to hold Mordax Prime, yet clearly such a large body of men was insufficient to stem the green tide engulfing that Forge World. The Segmentum Obscurus High Command drew up plans to send a further 35 to 40 regiments of the Imperial Guard to the world, drawn from the regional reserve to help bolster Mordax Prime's defences. Yet the Orks had set their sights upon capturing Mordax Prime, broadcasting their designs for the planet they referred to as "MoreDakka Prime" on every Imperial channel. Were it not for the fact that Mordax Prime was the sovereign preserve of the Adeptus Mechanicus, Imperial High Command seriously considered petitioning the Inquisition for an Exterminatus against the world before its vast resources fell to the enemy.


The Orks were able to batter down Imperial defences with sheer doggedness and not a little help from Chaos Space Marines, particularly from the Night Lords and the Black Legion. Now the Orks rule Lethe Eleven and Mordax, along with most of Imbrium and Ulant. Gudrun and Nysa Stromolo stand on the brink of anarchy and the weapon forges of Mordax (rechristened "MoreDakka Prime" by the Orks) are infested with Lootas of the Death Skulls clan, a truly terrifying prospect to the devotees of the Machine God, who know full well the depths of blasphemy against the Omnissiah to which these barbaric xenos will sink.

Battered survivors speak of hundreds of Gargants being built from the debris of war by enslaved servitors and their brutal Greenskin overseers. The squat, menacing forms of more Gargant construction sites climb over the plains of Mordax daily as Ork Mekaniaks race to be the first to complete their machines. Imperial stategists are now regarding the Green Kroosade as a full-scale Ork WAAAGH! Its Warlords are unknown but it would appear that Ghazghkull and Nazdreg are not among them. Only Thracian Primaris and Elnaur Delta have held firm against the Green Kroosade, bolstered first by the intervention of a Black Templars' Crusade, and later by the stalwart defence mounted by the Salamanders Chapter and many other Space Marine contingents. The situation is grim in Scarus. And none can see an end to the infestation given the dire situation across the region.

Notable People of the Sector

This sector is the theatre of operations for the renowned Inquisitors Eisenhorn and Ravenor.


Helican Sub-sector

The Helican Sub-sector was the site of the Helican Schism, a wave of rebellion, terrorism and sabotage that swept the area in the early 41st Millennium.

  • Thracian Primaris (Hive World) - Sub-sector capital planet.
  • Anemae Gulfward
  • Gudrun (Civilised World) - Former sub-sector capital planet which has had a human presence for over 3,500 standard years.
  • Hubris - A world named for the enormous pride of the original human colonists who founded a successful society despite the harsh and extreme climates.
  • Mariam
  • Messina (Civilised World)
  • Respa III

Angelus Sub-sector

  • Eustis Majoris (Hive World) - Sub-sector capital planet.

Antimar Sub-sector

  • Sarum - Sub-sector capital planet.

Kerak Sub-sector

  • Vraks Prime (Armoury World) - Vraks was the site of a massive campaign by the forces of the Imperium of Man in 813.M41, after the attempted assassination of the heretical and traitorous Apostate Cardinal-Astra Xaphan after a failed assassination attempt by the Officio Assassinorum. The Imperial Guard's 88th Siege Army was raised from line regiments of the Death Korps of Krieg to undertake the siege of Vraks and bring the Renegade cardinal down in a campaign  that the Administratum's Adepts calculated would take 12 standard years to successfully conclude. At the conclusion of what actually turned out to be a 17-year-long Imperial campaign of attrition called the Siege of Vraks that required 34 Regiments of the Imperial Guard to re-take the planet in 830.M41, 14 million Imperial Guardsmen had been lost and Vraks Prime's entire original population of 8 million souls had been consumed in the violence or exterminated after they fell to Chaos corruption. The world was then declared dead by the Imperium and placed under an interdiction to cordon it off from the rest of human space as ordered by the Ordo Hereticus Inquisitor Lord Hector Rex.

Ophidian Sub-sector

  • Ophidia - Sub-sector capital planet. Noted for being the site of the Ophidian Campaign (also known as the Purge Campaign), in which Battlefleet Scarus wrested control of the Sub-sector from Heretic forces. The campaign lasted from 240.M41 to 337-338.M41, a considerable achievement in such a short timescale.

Vincies Sub-sector (Lost)

Imperial rule was discontinued in the Vincies Sub-sector in 085.M41 after it was engulfed by a great and turbulent Warp Storm.


  • Codex: Eye of Terror (3rd Edition), pp. 16, 24
  • The Inquisition (Background Book)
  • Imperial Armour Volume Five - The Siege of Vraks - Part One
  • Imperial Armour Volume Six - The Siege of Vraks - Part Two
  • Imperial Armour Volume Seven - The Siege of Vraks - Part Three
  • The First Heretic (Novel), pp. 201-202
  • The Eisenhorn Trilogy Series:
    • Xenos (Novel) by Dan Abnett
    • Malleus (Novel) by Dan Abnett
    • Hereticus (Novel) by Dan Abnett
  • Eye of Terror Worldwide Campaign - Newsletter
  • The Scarus Sector at Fantasy Flight Games
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