You saved a cabal of mystics from being used by the Banished Pantheon.
How to Get
Earn the Mystical Savior Badge accomplishment badge by completing the Track down the Pantheon and rescue the mystics mission from Laura Brunetti or Miriam Bloechl.
The Mystical Savior badge is awarded to characters of the hero and vigilante alignments. The same badge on villains and rogues is called Mystical Adept.