Stygies VIII, also known as "The Ever-staring Cyclops," is an Imperial Forge World of the Adeptus Mechanicus that is located on the seventh and largest moon orbiting a massive gas giant on the outer fringes of the Vulcanis System in the Segmentum Pacificus of the Milky Way Galaxy. The planet is currently home to the Legio Honorum, a Loyalist Titan Legion also known as the "Deathbolts." The moon was previously home to both the Legio Vulcanum I and Legio Vulcanum II, but both of those Titan Legions turned Traitor during the Horus Heresy. Even before the Heresy it was very rare for a Forge World to be home to more than one Titan Legion.

Stygies VIII is a large Forge World that produces everything from Imperial Guard infantry weapons and battle tanks to the mighty Battle Titans of the Collegia Titanica. It is known that Stygies VIII is a Production Grade II-Extremis Forge World with a Tithe Grade of Aptus Non, meaning it pays no tithe to the Administratum, as its industrial output is considered of potent strategic value for the Imperium of Man in and of itself. The forge-cities of Stygies VIII are known to be the homes of some of the best munitions artisans in the Imperium and they produce gun barrels, recoil dampeners, and propellent chemicals second only to Mars itself in quality. Stygies VIII was once one of only three known Forge Worlds capable of producing Vanquisher Cannons on a large scale. After the Forge World of Tigrus was overrun in the 35th Millennium by the Ork Warlord Arrgard the Defiler and the Forge World of Gryphonne IV was consumed by Hive Fleet Leviathan, Stygies VIII became the sole known producer of Vanquisher Cannons. The forges of Stygies VIII are also known for producing the most common pattern of Manticores used by the Imperial Guard.


Stygies VIII is the moon of a ringed gas giant in the binary star system of Vulcanis. It lies far to the galactic north of Terra and perilously near the Eye of Terror. Stygies itself almost fell to heretic forces in the times of the Horus Heresy, only being saved by the intervention of the enigmatic Eldar race, who had their own sake in seeing that the Forces of Chaos did not gain access to such a strategic treasure which might turn the Heresy in Warmaster Horus' favour. This event has led to Vulcanis being the home of a secretive sect within the Adeptus Mechanicus known as the Xenarites. The Xenarites are dedicated to the study and exploitation of alien technology, a policy which most Tech-Priests find highly offensive. The Xenarites point to the intervention of the Eldar to assist the true followers of the Machine God as a sign that even they are subject to his will, and that it is their sacred duty to study them. Aware of the antipathy of their colleagues, the Xenarites pursue a policy of covert study, often despatching cohorts of Skitarii to garrison alien sites instead of bringing artefacts back to Forge Worlds for study as prescribed by doctrine. It is not unusual for Xenarite expeditions to come under attack from alien populations, planetary garrisons, even the Skitarii Legions of other Forge Worlds. Open war with Imperial authorities is not unknown -- these regrettable occurrences have only served to drive the Xenarites deeper underground.

Notable Events

  • The Xenarite Schism (335.M36) - Stygies VIII comes under attack from dozens of Deathwatch Kill-teams when news of the Xenarites' dabblings with alien technology reaches the Ordo Xenos. The Adeptus Mechanicus on Stygies VIII are forced to employ radical measures in order to survive the ensuing purges.
  • The Unknowable (991.M41) - Skitarii from Stygies VIII are sent to the diluvian-class world of Magogue when the planet's industry dries up its oceans to reveal Necrontyr architecture. The Skitarii fight valiantly against the Necrons of the awakening tomb complexes, allowing the planet’s islander people to evacuate to a man, but are badly outmatched. Only their commanding Tech-Priests, hunting for knowledge behind the lines, escape the ensuing carnage. However, in doing so they clash with Trazyn the Infinite. One by one the Tech-Priests are collected in stasis fields and displayed as part of a monument to Magogue's fall.

Stygies VIII Appearance

Stygies VIII Iconography

Ryza Forge World

The official Imperial stamp of the Forge World of Ryza

The stark white icon of Stygies VIII stands out from the dark robes of its warriors. It symbolises not just enlightenment, but the acquisition of knowledge no matter how steep the cost.

Stygies VIII Forge World Colours

Stygies VIII has been accused of heresy in the past. To show that its faith in the Omnissiah is pure, its heraldry incorporates the colours of Mars, albeit redistributed. The bulk of Stygies VIII's Skitarii wear long black robes, crimson armour plate and burnished steel cybernetics. Should such a warrior shed his robe, he could almost pass for one of Mars' cohorts -- a similarity Stygies has exploited many times. The officers of Stygies VIII fight at the forefront of the war for enlightenment. When their red, silver and black heraldry is sighted near an excavation or quarantine zone, the treasures inside will be seized in Stygies' name, whatever it takes.

Canon Conflict

The location of Stygies VIII has been listed as being located in three different Segmentae according to different sources. In Imperial Armour Volume One its location is given as the Ultima Segmentum, in White Dwarf 260 (UK) it is listed as being in the Segmentum Obscurus, and most recently in Imperial Armour's Horus Heresy - Book One: Betrayal it is shown on a map as being located in the Segmentum Pacificus. As the latter source is the most current of the three sources to be released, Stygies VIII is listed above as officially located in the Segmentum Pacificus.


  • Codex: Skitarii (7th Edition), pp. 31, 37, 39, 78-84
  • Imperial Armour Volume One - Imperial Guard and Imperial Navy, pp. 8, 11, 31-46, 178
  • The Horus Heresy - Book One: Betrayal by Alan Bligh, pg. 11
  • White Dwarf 260 (UK), pg. 65


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