You needed to beat Tucker, William, and Kato in the arena in order to do this quest. This is a part of the basic training. You needed to complete this quest in order to get access to the upper level of the monastery and get the door of the monastery open. You needed to talk to Aric, and told him that you beat Tucker, William, and Kato. Then, you can invite him to the Arena and fight. The fight may have two outcomes: 1. * Aric was defeated 2. * You were defeated