One of many specialised castes of cyborg warriors available to the Adeptus Mechanicus, the Pteraxii are optimised for instinctive reaction and agility. Pteraxii’s reflexes are accentuated by paring back elements of cogitation that impede their primary function. Implanted with additional limbstumps – scapuli superior – on their back, a flight pack of thrusters and reactive life surfaces is connected to them. The flight packs become part of the Pteraxii, who serve in several roles. Sterylizors are honed for aggression, and their legs end in vicious, spur-like talons. They scour cavernous forge temples free of technosites and cyblight infestations, and Tech-Priests do not hesitate to turn the Sterylizors’ phosphor torches on intelligent adversaries.