The Hero's Journey Boon System is a mechanical tool for GM's to use as a reward for character development and great roleplaying. It reminds both the GM and the players to pay attention to those iconic moments when a critical choice transforms a character's development toward or away from a certain personality trait or archetype.
To symbolize this change in a character's development over the course of an adventure, a Hero's Boon gives a mechanical bonus that allows a GM to mark that character's moment of transformation in a palpable way.