When you battle the boss at the end of every dungeon keep an eye out for the burning flame that appears right below its feet as this indicates that it is casting a skill. If when this happens you attack the boss with one of your skills you can if timed correctly prevent the boss from casting its skill and also deal heavier damage compared to your normal skill damage. Your skill will also stun the boss for several seconds allowing you to attack and get more hits. Note: if there are too many flaming effects during the battle to see the burning flame then look out for a double swords icon that appears above the boss's head.