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'''Enhanced Warriors''', also known as '''Terata'''{{Fn|4b}} are subjects, who, either willingly or unwillingly, undergo extensive genetic manipulation at the hands of [[Fabius Bile]]. Fabius began development of these warriors in his position of [[Apothecary|Chief Apothecary]] of the [[Emperor's Children]] during the [[Horus Heresy]] when [[Horus]] gave him an improved [[gene-seed]] code stolen by the [[Alpha Legion]] from the [[Raven Guard]]. However unknown to Fabius [[Alpharius]] had secretly corrupted the code and as a result, much like the Raven Guard's [[Raptor (Raven Guard)|Raptors]] before them, his initial experiments were short-lived mutations.{{Fn|4c}}{{Fn|5}} Some of the Enhanced Warriors were made from the [[Iron Hands]], [[Salamanders]], [[World Eaters]], [[Death Guard]], [[Alpha Legion]], [[Word Bearers]], [[Sons of Horus]]{{Fn|4c}} and [[Imperial Fists]].{{Fn|4d}}