Hellfire Flamberge

The Hellfire Flamberge is a craftable Hardmode broadsword that autoswings. On each swing, it fires out two small fireballs and one large fireball at slightly randomized angles and speeds. Small volcanic fireballs deal 50% of the weapon's damage and large volcanic fireballs deal 75% of the weapon's damage, both additionally inflicting the On Fire! debuff. The fireballs aren't affected by gravity, slow to a stop and disappear shortly after being fired, and cannot penetrate tiles nor enemies. The sword itself also inflicts On Fire! on enemy hits.

Trivia

 * A flamberge is a type of sword with an undulating wave-like blade design meant to resemble fire. The Hellfire Flamberge features this blade design.