I've gotten to the point in this game where I'm completely unable to progress. My units are just not strong enough, or I don't have the right abilities/equipment.
In the story I'm up to Snowy Woods - Fluttering Fairies and the boss basically one shots my entire team. Even your guys' high end borrowed units aren't enough to kill the mini-wisps that the boss has helping it.
Also unable to progress in the colosseum. I can't beat the boss of ADV, C-1. His group attack levels my entire team.
Team I'm using is Gilgamesh (6 star), Cecil, Butz, Exdeath, Refia (all 5-star), all max level.
I'm not sure what I can do from here to progress and make myself stronger. Do I need to grind out some TMR like dual-cast and dual wield and stuff?