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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 [[Power Armour|Space Marine armor]].