During this ritual process, some of the Emperor's own vast psychic energy is transferred to the psyker, which will enable them to transmit messages instantaneously over vast interstellar distances through the Warp if they are Astropaths or wield their powers with the discipline required to prevent daemons and other Warp entities from possessing their minds if they are another type of Sanctioned Psyker like an Imperial Guard Primaris Psyker or a psychic Inquisitor. This transference of energy is traumatic for the psyker -- not all survive this painful process, despite standard years of ritual preparation, and not all those that survive retain their sanity. Even many of the survivors, usually those of weaker ability, often suffer severe physical damage to the sensitive optic nerves of the ey