When to use limit break?

[Anova]

Usually, limit breaks are used at the end of a boss fight or to push a boss past a certain phase.

In most dungeon runs, you fight 3 bosses. The LB gauge is actually maxed at the first boss and most people will use it then as there is plenty of time for it to recharge. Some players use it at the 2nd boss, but others save it so they have a 2-stack LB for the final boss.

There really is not a huge difference for when a Lancer uses a LB. The exception would be for certain dungeons where a mage will use an aoe to clear mobs faster. However, those are almost always at level 50 and 60 and players usually tell you beforehand.

I wouldn't worry about it normally and just use it on bosses. If you're really unsure of what to do, just use the LB on the last boss. Let mages worry about using it before then.

The only problem most people have with LB is if a tank or healer uses it (as there are literally less than 5 fights where damage prevention/healing is useful enough to warrant a LB).