Sunfury

The Sunfury is a Flail weapon obtained from Shadow Chests in The Underworld. It emits light when thrown, and can also set enemies on fire. Like other Flails, it is a ball-and-chain that swings outward, returns when its maximum distance is reached, is largely affected by gravity, and will continue to hang off the player if the attack button is held, causing damage to enemies that touch it. If you throw the sunfury into the lava it will grant you an extra sunfury, also giving the one you threw in the lava back.