Frederica , a shape - shifting dragoon , joins their party .
Over the course of the series , the group faces difficulties as each of the Eight Heroes has kept their share of the Emperor 's remains to harness its magic energy .
Frederica , a shape - shifting dragoon , joins Eight Heroes ' party .
Over the course of the series , the group faces difficulties as each of the Eight Heroes has kept their share of the Emperor 's remains to harness its magic energy .