Flare

Flare, previously known as Nuke, is a magic spell in Final Fantasy Adventure and Adventures of Mana. It is learned by reading the Book of FlareAoM/Magic Book of NukeFFA found after defeating the Lich

Final Fantasy Adventure/Adventures of Mana
After retrieving the legendary blade form the Undersea Volcano, Sumo learns from The Professor in Ish of a mystical magic spell capable of revealing the entrance to the Buried Ruins in the Crystal Desert. The spell, however, was kept by the fearsome Lich in Sealed Cave, so the hero must slay the monster in order to obtain the ultimate spell.

Description
This magic has the most destructive force of all. Like Lit, it can only be shot in a straight line.