Muramasa - Official Terraria Wiki

The Muramasa is a blue broadsword that is found in the Dungeon's Locked Gold Chests or in Golden Lock Boxes(Desktop, Console and Mobile versions), both of which are opened via a Golden Key. The Muramasa has a slightly longer reach than the Phaseblade and has a fast attack speed. It is also worth mentioning that it is an autoswing sword, not many of which can be found during pre-Hardmode. When swung, it emits a small amount of blue light.

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