Astra Militarum - Tech-priest Enginseer: A Tech-priest Enginseer is a heavily armoured warrior from the Adeptus Mechanicus who can repair tanks and other Imperial vehicles on the battlefield. They can be accompanied by up to five other lobotomised cybernetic servitor units, who can aid the Tech-priest in ranged combat or repairing vehicles.A Tech-priest has numerous cybernetic enhancements which aid them in the performance of their duties, such as when tanks and other vehicles need to be repaired under heavy fire or extreme time constraints. Many Tech-priests have their lungs replaced with mechanical breathers or portions of their cerebral cortex replaced with cogitator (computer) circuitry to allow for easier interfaces with the archaic but advanced technology of the Imperium. Some of the more fanatically devoted Tech-priests who worship the Cult Mechanicus have their blood replaced with a synthetic oxygen-carrying chemical substitute, to minimise the effects of wounds and injuries inflicted on the field of battle. Many Tech-priests choose to have the serpentine cybernetic Servo-Arms called Mechadendrites installed, as an extra limb is always useful for both combat and repair duties.The Servo-Arm is the most iconic tool of the tech-priest Enginseers serving within the Astra Militarum. Powered by whirring servos, these large robotic limbs are articulated such that they can reach every point within several feet of the Tech-priest, and have enough strength to lift a tank chassis while track repairs are made. With an industrious Machine Spirit, a Servo-Arm is endlessly driven to repair and maintain its fellow mechanical creations, though should a Tech-priest desire, it can also visit ruin upon those who would interfere with his work. Its powerful claw, designed to clamp shut rents in the hulls of tanks, is equally effective at severing limbs and crushing skulls. With a single swipe, the Servo-Arm can send a Chaos Space Marine flailing, or punch through the ensorcelled plating of a taint-ridden Daemon Engine.The Tech-priest Enginseers are privy to the mystical secrets of the Machine Spirits that the Adeptus Mechanicus' Cult of the Machine God believes inhabits all Imperial vehicles and technology and they are held in high regard amongst the Imperial Guard's armoured companies, which are comprised primarily of tanks and other vehicles. However, in most Imperial Guard armies, the Tech-priests are shunned by their fellow Guardsmen because of their bionic enhancements and cybernetic disfigurements.Many Tech-priest Enginseers are accompanied on the battlefield by retinues of mindless Servitors. These lobotomised cyborg slaves are often vat-grown, though many were vicious Imperial criminals or Heretics prior to their enforced conversion. Regardless of their origins, most Servitors will boast industrial cybernetics allowing them to aid their master in his work. Others are fitted with hefty heavy weapons whose chattering volleys drive back the foe and permit the Enginseer to make his repairs without interruption.Servitors make effective battle-line troops, but only when shepherded by a Tech-priest who can engage the raw circuitry of their minds to direct their unthinking aggression. Without such guidance Servitors do little but fire wildly, and may even wander off without warning in pursuit of some erroneous protocol.