When you use an active skill, your character will become invincible for the duration of the skill's animation. Use this to your advantage when you know a big attack is imminent, such as from a Boss. This can also be used to develop a hit-and-run tactic, where you can dash to a dangerous opponent, use all of your skills to do lots of damage without fear of retaliation, then running out and waiting for the cooldowns to end.
