Skill burst - you can earn ability points AP during battle and use skill burst. Try applying various burst effects to strategic combat. You must carefully plan to end battle. Pay particular attention to your combat speed. The ally farthest to the right on the priority gauge will take the next turn. If you fall before your turn, you will face a huge disadvantage.
SKill chain is a linked attack in which all 4 allies attack together at once. Defeat the boss with a powerful chain effect. Tap on the adventure button and i shall search for a suitable place. A small number of hostile creatures have been detected, but they do not appear to pose a threat.