Fire has good healers in Brynhildr and Summer Sol, Regen with a few SR's and Amaterasu as well as defense buffs, also you dont wanna use a debuffer soul, you either go (for this raid) with raw damage or Joan D'Arc to help you cover as well, if you lack the pieces there's still workarounds, not as effective, sure but better than block heading Debuffs against this raid.