Granblue Fantasy: Relink has a feature-packed Mastery system tree that unlocks unique skills for all the characters in the game. Upgrading the Mastery tree boosts a character's strengths and abilities while making them work better as part of a team for the more challenging boss fights in the story and the optional side quest missions available at the Quest Counter in Granblue Fantasy: Relink. More importantly, the further down the tree, the more skills the party can unlock to equip in battle.