You get to choose a leader to evaluate to your offered team Whenever you start a new battle. That leader can just come from among the twelve classes, and if you do not have a leader of the class needed because battle, then you'll need to battle without him. The very best thing would be to gather a leader from each class, so because case you will never ever enter into a battle without a leader. Even if they are of lower quality, they will still be a pertinent addition to the team. My recommendation here is to gather as lots of leaders as possible, however ideally from the Expert Incantation and Master Incantation. The other two are OKAY too if you do not have more gems, however they should not be your very first option.