How do I unlock the locks on the heroes?

Once you recruit the heroes you will be able to unlock the skills for them. Each skill will have requirements to unlock. The first will be an experience level that the hero needs to reach. This is done by sending them to battles to gain experience or by using Exp items that you get from game rewards.

Once you reach the required level you can then unlock the skill with money, wisdom medals, and in some cases hero medals. Some of the skill require specific hero medals meaning that you will need to have recruited the hero more than once to receive a duplicate hero medal.

In the hero menu you can tap on any hero to see the details and then tap the scroll icon at the bottom to see the hero skills. Tap on each skill to see the effects and the requirements to unlock it.