Quote Originally Posted by Frostyy View Post
I think that differs in dungeons.
I believe they were talking about using it at the start of a single fight and having it refill by the end of that same fight, which might only happen if the fight goes on for longer than it really should.

I've accidentally used it at the start of that exact boss, actually (I meant to use it after he transformed and then proceeded to use it at the pre-transformation start cause my mind was in "do LB" mode), and it wasn't refilled by the end.

Note that this was as a melee DPS. You seemed to indicate you were there as a MCH, which means you'd have done even less damage at the start. Not really worth it then. The only place I've seen it be worth it are on fights where the LB resets at the start of the fight anyway and you're going in with a max pre-fight bar, like against Nero in Praetorium.