Terraria (Wiki): Shroomerang

The Shroomerang is a type of thrown melee weapon that returns to the player after damaging an enemy (non-piercing), traveling for 24 tiles away, or hitting a solid object.

When normally used, the Shroomerang will emit light, making the players see a little better in the dark. It also phases through any type of block when returning to the user. The Shroomerang can also squeeze through one-block-wide gaps at the right range. When used on liquids, the Shroomerang’s travel speed and range drastically decrease.

It is a general rule to aim above enemies for unlimited piercing when using the Shroomerang. This unique property is possible thanks to all Boomerang’s capability of phasing through walls. One can easily handle a wave of slightly weak enemies and deal high knockback with the Shroomerang.

At the right range, enemies will receive two consecutive damage as the Shroomerang goes to the target and back to the player. Damaging enemies on both ends of a wall is also possible when executed at the right position and range. This unique property makes the Shroomerang pass through walls unhinged while keeping hostiles at bay.

The Shroomerang can be partnered with any backup weapon if the thrown weapon is still traveling midair. Alternatively, the player could just get in close range and land consecutive attacks, as the weapon’s use time is determined once the boomerang returns.

Since the Shroomerang is a melee weapon, some accessories, all flasks, and armor can enhance its travel range, flight speed, and apply flask-related buffs.

The Shroomerang is best modified with Godly or Demonic, providing a wide array of stats improvement.