Fire Blast...
...can cause severe damage to every unliky person within range.

But it is nothing compared to the attack shown below!

Gattling Flame
Caution, this may get hard. Gattling Flame is dangerous for all your friends.

Even if equipped with special items like Dragon Angel Guard you should use White Dragon Protect to shield your party from instant death.

Standard Attack
Red Fiend even uses his fire claws to inflict some damage.

Again, this attack is weaker then his breath attacks.