Arcthunder (ギガサンダー Giga sandā) is a Thunder Magic tome from Fire Emblem: Radiant Dawn and Fire Emblem Awakening. When cast, multiple bolts of lightning will rain down from the sky to strike a selected enemy target. A fairly potent tome, Arcthunder, like all other Thunder Magic spells in Radiant Dawn, is effective against Dragon tribe Laguz, and can only be purchased in Parts 1, 3 and 4 of the game.