Fireball is a magic technique which hurl fire at the enemy. It's created by making a wave gesture with the wand, creating a magic trail in the form of pentagram circle, which upon completion will be on fire. After that, the fire will presumably be shot at the enemy. Fanimer, a prodigious magician, skip the wave gesture and instead only using the wand itself to summon fire, even including fireball into his "harmonized" spells.