Sep-trial.slf

: Bosses have shields that must be broken to deal significant damage. Matches are timed, and you typically need to break the boss's shield twice to finish them within the limit.

While sep-trial.slf is not a standard file, here are three plausible real-world cases I have encountered with similar naming patterns: sep-trial.slf

: Use your first Resonance skill as soon as the first mini-boss or "frenzied" enemy appears to chip away at the boss's shield early. : Bosses have shields that must be broken