The first dungeon I did in FF I was like "what's this limit break bar?" They told me it's to increase dps on boss fights. And not to touch it unless they said to. Then they told me to lb and I was clicking madly on the bar... Lol no one told me there was a spell to make it go off. They we're nice people and we laughed about it. Even if it was bad info. I don't think I have ever actually pressed the button though. I only recently found out it isn't only for dps.