To view the Skills panel, click the Skills button, located on the bottom toolbar. Skills give players extra attacks. They are particularly useful in doing large scale damage to groups. Skills are classified into 3 categories: Attack Skills, Support Skills and Defensive Skills. Certain skills will also unlock as you level up. Note that you can equip four skills at one time. Using different skills in combination will produce different effects, so give them all a try!
Upgrading skills require Skill Crystals (obtained from dungeons) and different skills require different types of Crystals depending on the type of skill. Attack skills will require Attack Crystals, while Support skills will require Support Crystals. The higher the skill level, the more powerful the effect it has. Remember to use your Skill Crystals wisely!