Múspell Flame is Brynhildr's final attack in Gestalt Mode. It expends all ATB and engulfs all enemies in roaring flames, dismissing Brynhildr.
Múspell Flame is the ability of Brynhildr, which doubles stage bravery and doubles base bravery for a set period of time.
Múspell Flame refers to Múspellsheimr. Múspellsheimr is the realm of fire and home to the Fire Giants and Surtr in Norse mythology.