A Servo-skull is a drone-like robotic device that appears to be a human skull outfitted with electronic or cybernetic components that utilise embedded anti-gravity field generators to allow them to hover and drift bodiless through the air. They are fashioned from the skulls of loyal Adepts of the Adeptus Terra and other pious Imperial servants to which robotic components and an antigravitic impeller have been added. This is so that they may continue their work for the Emperor of Mankind even after death. To have one’s skull chosen to serve as a Servo-skull is a great honour in the Imperium, for it implies one’s service in life has been satisfactory enough to warrant continuation beyond death.
Daniel J. Schneider