Limit Break [please learn when to use it or tell others when to]

[Ixsiehn]

Theres no point "saving" it if a wipe is imminent since LB bars gets reset upon death, asking you to use the LB is a last ditch effort to burst down the boss before they wipe...

This only applies to certain bosses in 8-man instances. Your LB bar does not reset in 4-man dungeons or unimportant bosses like all bosses before the last boss in CM (or last 2 if you consider her as 2 bosses).