Arcfire is a type of fire magic appearing only in Fire Emblem: Radiant Dawn and Fire Emblem Awakening. In Super Smash Bros. for Nintendo 3DS / Wii U and Super Smash Bros. Ultimate, it is Robin's side special move.
When using the move, Robin creates a ball of fire that is thrown in the direction in front of himself until it his the ground or an opponent. After it hits, the fireball creates a small pillar of fire that can hit opponents multiple times. Arcfire can only be used six times before it "breaks," in which case the player must wait about ten seconds before it returns to Robin and can be used again. The finishing move from Robin's strong neutral attack also uses Arcfire's durability.
In Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, the two variations of this move are Arcfire+ and Fire Wall. Arcfire+ takes longer to cast, but explodes when it hits, dealing a singular, more powerful hit. Fire Wall casts a larger pillar of fire that deals greater knockback rather than multiple hits, and can also protect from attacks.