Dynamis - Limit Breaks

[Absimiliard]

In the reworked Praetorium fight, you get a chance to use an LB3 Limit Break despite being in a 4-man party because, "Your fervent hope shines forth as resplendent Light, granting you strength beyond your limits!"

That's Hydaelyn giving you a mulligan. You get no such assistance against Endsinger.