Big Bomb is a Bomb-elemental skill introduced in Epic Battle Fantasy 5.
Big Bomb is derived from the "peace bomb" aspect of the Air Strike skill from earlier games. Big Bomb deals heavy Bomb-elemental damage with a chance to Stagger targets, though it also has a sizable cooldown time which makes it far less reliable than before.
The black bomb from the original Air Strike was redone into M.O.A.B. (Mother of All Bombs).
Epic Battle Fantasy 5
Big Bomb becomes Air Strike at level 3.