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The Interex were a highly advanced Human civilisation during the time of the Great Crusade.[2a]


Interex were tall humans with only one genetic difference - large bat-like ears that helped them use their unique language based on music and sounds. Interex still used language - an evolved human dialect of Terra - but very rarely.[2a]


The Interex were humans originating from Terra, that created their own civilization.[2a] At some point they made contact with the Eldar, who told them about the dangers of Chaos and the threat that the inhabitants of the warp pose to humanity.[2c]. Later, the Interex made contact with the Kinebrach, who were defeated as a result of a long war and subsequently entered their society, becoming an inextricable part. After that, the Interex encountered, defeated and localized the aggressive alien Megarachnids on the planet Murder (Urisarach in the language of the Interex, meaning Spiderland). The Megarachnids had begun to attack the frontier planets of the Interex, infesting eight Interex systems at the start of the conflict.[2a] During the Great Crusade the Interex were encountered by the Luna Wolves[2a] and at that time their civilization included 30 systems.[2b] The technology of the Interex was in many ways more advanced than that of the Imperium, but not as strongly focused on warfare.[2a]

Devoted to fighting Chaos, (they referred to it as 'Kaos'), they regarded the 63rd expedition skeptically, as they thought they might be tainted by it. They were in talks with Horus and his peers[2c] when somebody[2c] (later discovered to be First Chaplain Erebus of the Word Bearers [2d]) infiltrated the Hall of Devices, the Interex museum of artefacts and weapons, sabotaged the building to explode[2c], and stole a valuable and dangerous Kinebrach sword known as an Anathame. Fighting broke out between Space Marines and Interex forces until Warmaster Horus was successfully evacuated off planet.[2d] The stolen Anathame, secretly taken by Erebus, would be the weapon that later mortally wounded Horus. The Interex are confirmed to have been destroyed in an Imperial campaign before the beginning of the war on the Auretian Technocracy.[1]


The Interex had incredibly advanced technology available to them. At first glance, many of Horus' warriors believed the Interex to be aliens in the shape of centaurs.[2a] Later it was found the centaur base was a form of mobile fighting platforms for Interex warriors. They would step into the base, and form a centaur-looking warrior with increased mobility.[2b] They also used a type of bow or crossbow that the warriors of Horus wrote off as decorative parade weapons,[2a] until a skirmish revealed that they could emit bolts of light fully capable of punching through Space Marine armor.[2c]

The Interex also had automated drones[Needs Citation] throughout their society that were akin to Advanced AI, as opposed to the Imperium's more barbaric-like use of servitors.

Interex Elements

  • A Marvelous Historie of Eevil; Being a warninge to Man Kind on the Abuses of Sorcerie and the Seduction of the Daemon - an ancient tome of Interex pre-history; a treatise against the practice of sorcery and fiddling with Kaos (Chaos).[2c]
  • Aria - special and very diverse music that Interex used to communicate as a language. Fundamental part of their communications.[2a]
  • Diath Shehn - abbrocarius. Made first contact with the Imperium, meeting Horus and the Luna Wolves after the War on Murder[2a]
  • Gleves - warriors of Interex who used long-bladed perfectly balanced metal spears[2a]
  • Kaos - the general concept of Interex about Chaos, warp and their malignant inhabitants[2c]
  • Meturge (players) - speciaists of Aria[2a]
  • Mithras Tull - one of the subordiante commanders of Xenobia. Was injured but spared by Garviel Loken after it became known about the attack of Terran on the Hall of Devices[2c]
  • Saggitars - warriors of Interex who used recurve bows forged from some dark metal[2a]
  • Shartiel Edge - part of Interex realm[2a]