Disciples of the Machine God.
Behold - the Cult Mechanicus approaches. A grim procession of augmented horrors and soulless automata, they bring not salvation, no message of peace; they are not interested in conversion to their creed. Their purpose is death, recorded and measured for later assimilation. Marching implacably from world to world, scorching the skies with the colossal energies they harness, the Tech-Priests of the Cult Mechanicus hum their machine-code prayers in bursts of eerie static as they drain the very bioelectricity itself from all who stand in their way. A sinister display of absolute, unshakeable faith wielding the most advanced technology in the Imperium - dare you oppose the will of the Omnissiah?