Cutlass

The Cutlass is a rare sword that is dropped by Pirate Deckhands in a Pirate Invasion. It appears to be a scimitar with a gold handle and an iron blade. The Pirate Invasion is only summoned when using a Pirate Map. The Cutlass deals very high damage, even higher than Excalibur. The Cutlass has a very fast attack speed and you can swing it continuously.

Trivia

 * This can be considered a Hardmode equivalent of the Muramasa - it automatically swings, has a lightning-fast attack speed, and relatively low knockback.
 * Strangely, this has a lower rarity than the Excalibur, despite it being stronger than the latter.
 * In the game, the white pixels in the Cutlass' sprite appear to be missing, making those parts completely transparent.