Cobalt Sword

The Cobalt Sword is an auto-swung Hardmode sword, often confused with the Muramasa and is crafted using Cobalt Bars. It swings faster than the Mythril Sword and the Adamantite Sword.

Trivia

 * The Cobalt Sword bears a resemblance to a Japanese Katana, and fits with the "Feudal Asia" theme of other cobalt weapons and armor.