Each Hero has 01 Active Skill and at most 03 Passive Skills based on its basic star level.
These skills are to be cast throughout a match. An Active Skill is cast when the energy bar is full and Passive Skills take effect throughout combat, enhancing the Hero's combat abilities.
During combat, above each Hero, there is an energy bar (in yellow) located under the health bar indicating the energy level of that Hero. At full energy, the Hero will cast its active skill in the next turn.
Energy is gained when a Hero takes or deals damage.