Flamelash

Flamelash is one of several Magic Weapons found throughout Terraria, obtained from Shadow Chests. When cast, it launches a mouse-controllable ball of fire, which also emits a small light radius, and gives off embers which fall through the ground. As it costs only marginally more Mana to cast, but inflicts more damage and has a chance to inflict the On Fire! debuff, it is considered a higher-tier version of Magic Missile. When the attack button is released, the ball keeps its course until it hits something.