A Sanctioned Psyker is a unit of the Imperial Guard race. They are mutants that have been recruited into the army. They have psychic abilities and regularly have visions, some of which are so explicit cause some Sanctioned Psyker's to become psychopathic. They are a weak unit and can explode on occasion. They wield a staff like weapon and resemble mages found in other games.
They are an attachable support unit and can be attatched to stronger units, this way the psyker is protected.