SaGa Scarlet Grace: Ambitions ~ Ultimate Final Boss: Firebringer Prime

Firebringer Prime is the fully powered up version of the final boss who you can fight after offering up the 20 Celesta Stones from the other superbosses in the game. It only affects the 3rd and final phase of the fight but Firebringer Prime hits very hard. In this fight, I use the Double Hypergravity strategy but even with the defensive roles (Elemental, Maestro of Flames, Barrier), there still is a good chance my protectors can die before it happens. After the initial 4 turns, you can slowly kill Firebringer Prime. Just note that Firebringer Prime resurrect 2 times during the fight which you can use to your advantage if you kill him before he attacks that turn.