Fire Dragon King's Roar

Fire Dragon King's Roar (炎竜王の咆哮 Enryūō no Hōkō) is a Fire Dragon Slayer Magic Spell.

Description
The user produces a searing hot flame in their mouth before unleashing it in the direction they are facing. The unleashed flames engulf a large scale area that is hot enough to not only scorch the earth beneath it but destroy it, leaving a U-shaped valley in its wake.