During their turn, the active player may activate Champions by playing Action cards that belong to that Champion, or by using standard Actions. These Actions can be played by exhausting the Core of the matching colour. The other player may play Reaction cards. Players may play cards in any combination, and as many as they like, as long as they have the matching Core ready in order to play it.
Most Action cards allow Champions to move and resolve an attack or a skill explained in that card’s text box. Champions may be activated more than once per turn as long as the appropriate Core can be exhausted to pay for it. An Action card must be completely resolved before the same player may play another.