Fire Dragon King's Roar (炎竜王の咆哮 Enryūō no Hōkō) is a Fire Dragon Slayer Magic Spell.
The user produces a searing hot flame in their mouth before spewing it out in the direction they are facing. The unleashed flames engulf a large-scale area and, with their incredible heat, can not only scorch the earth beneath it but utterly vaporize it, leaving a U-shaped valley in its wake and taking out an entire battalion's worth of as much as exactly 973 soldiers, or even defeat a Mage as powerful as Bluenote Stinger in one shot.
|Basic Spells||Fire Dragon's Brilliant Flame • Fire Dragon's Claw • Fire Dragon's Crushing Fang • Fire Dragon's Flame Elbow • Fire Dragon's Grip Strike • Fire Dragon's Iron Fist • Fire Dragon's Roar • Fire Dragon's Roasting Bath • Fire Dragon's Sword Horn • Fire Dragon's Wing Attack|
|Advanced Spells||Crimson Lotus: Exploding Flame Blade • Crimson Lotus: Fire Dragon's Fist • Crimson Lotus: Phoenix Blade • Purgatory Dragon Fire|
|Dragon God Spells||Dragon God's Brilliant Flame|
|Planetary Flames Spells||Planetary Flames: Exploding Flame Blade|
|Fire Dragon King Spells||Fire Dragon King's Brilliant Flame • Fire Dragon King's Destruction Fist • Fire Dragon King's Purgatory • Fire Dragon King's Roar|
|Fukuro's Spells||Fire Ho Ho Hou • Fire Dragon's Roar|
|Velveno's Spells||Fire Dragon's Roar • Fire Dragon's Iron Fist|
|Natsu's Spells||Phoenix Impact|