Well, I've taken Lyner out near post game, where the player must go out and collect the "dreams and wishes" for Shurelia to make a Hymn Crystal. So while it appears to be low, his offense and defence are pretty strong against a lot of monsters and the only ones to give him trouble would the the "Child of Light", Mir's final boss form at the Crescent Chronicle and majority of the random monsters at Plasmabell.