Radiant Historia - secret boss Vainqueur

the 1st form is easy, but be careful with the next if you don't know how to face this boss: you have to start the quest "The Living Legend". in the node "waiting at skalla", go to the west of Itolia Wasteland and talk to the man in the well. He'll ask you to find 3 other people who are the disciples of a martial arts master, then he'll let you meet his master - Vainqueur. Vainqueur will become your master, he teachs you some skills (Stocke, Eruca and Aht) if you give him the "pacts". If you can give him all 12 pacts, he'll challenge you as you can see in my video. Stocke lv70 Aht lv65 Eruca lv68 plz tell me if you know a better strategy for this battle www.gameforgood.com