Set Magic Spells and Summons to your Units to make use of them in battle. Each Skill produces different effects, so you can customize your Units to give them dramatically different abilities.
Certain Skills are ultra-rare and will only be discovered by the most determined of adventurers.
A break gauge will appear during boss encounters.
This gauge will decrease gradually with each attack. When it reaches "0" a break is triggered and the boss' defense is significantly lowered.
Using your breaks strategically is a key factor in defeating many bosses.