An active skill is a bonus or positive effect that the player can choose to use once it is fully charged. To use an active skill simply select the desired skill in the skills tab and click on the “Select” button. Its icon will then appear in the active skill slot.
The icon will also appear in the active skill slot during combat and will be available to use once it has charged. Your selected active skill charges when you are damaged by enemies. The amount of charge is visible as a circle around the skill’s icon when at a location. You can also fully charge a skill by using the Altar.