Role aptitudes
Defence, Intelligence, Knowledge, Perception, Willpower
Role talent
Resistance (Psychic Powers) or Warp Sense
Role bonus
Stare into the Warp: A Mystic character starts the game with the Psyker elite advance (see page 90). It is recommended that a character who wishes to be a Mystic have a Willpower of at least 35.
Ignis Aeternus WH 40K campaign notes 