Each of your Daemons comes with active and passive skills slots that enable you to assign them active and passive skills to increase their effectiveness during battle. You can assign three active skills to each Daemon and once you activate them a countdown will appear on that specific active skill and you will be forced to wait until it is ready to use again. Passive skills work differently, when equipped to a Daemon they will grant you bonuses all the time and affect all the Daemons in your party. Make sure you always have passive skills in all your Daemons slots. Check out our Soul Stones Guide to find out how they are used to upgrade Daemons to make them more powerful.