Rumbling Flame (轟炎 Gōen) is a fiery [[:Special:Ask/-5B-5BCategory:Spells-5D-5D-20-5B-5Bspell-20category::-5D-5D-20-5B-5Bspell-20type::-5D-5D|area attack]] cast by Agito, generating a giant fireball to knock for explosion. It is a spell originally used in a Unison, comsuming also the Lord's mana. Considering the weak condition of Zest, Agito chooses to cast it solely, which makes her burden overloads.