Interex

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

Overview
The Interex maintained a close alliance with alien races such as the Kinebrach. They were encountered by the Luna Wolves during the Great Crusade. The technology of the Interex was in many ways more advanced than that of the Imperium's, but was not as strongly focused on the waging of war. Devoted to fighting chaos, (they referred to it as 'Kaos') they regarded the 63rd expedition sceptically, as they thought they might be tainted by it. They were in talks with Horus and his peers when a marine tainted by the powers of Chaos infiltrated a Interex museum housing alien artifacts and sabotaged the building to explode, which in many ways affirmed their initial beliefs. Fights broke out between Space Marines and Interex forces until Warmaster Horus was successfully evacuated off planet.

It should be noted that the Interex warriors were quite a match for the Space Marines under Horus' Command.

As Horus halted his attacks on the Interex, and the Heresy began shortly after, it's unknown if they were ever destroyed.

Technology
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. Later it was found the centaur base was a form of mobile fighting platforms for Interex warriors. They would walk into the base, and form a centaur looking warrior with increased mobility. They also used a type of bow or crossbow that the warriors of Horus wrote off as decorative parade weapons, until a skirmish revealed that they could emit bolts of light fully capable of punching through Space Marine armor.

The Interex also had automated drones throughout their society that were akin to Advanced AI as opposed to the Imperiums more barbaric-like use of servitors (wiped brains serving as CPUs).

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