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  • Murasama (Sheathed).png Murasama.gif
Stack digit 1.png
Damage2222 True melee
Knockback6.5 (Strong)
Critical chance65%
Use time25 Slow
TooltipA high-frequency blade that can cleanly slice through even the mightiest foe
Every third swing deals immense damage
Prove your worth by slaying The Devourer of Gods to unsheath this sword
'There will be blood!'
RarityRarity Level: 14
Sell 40 Gold Coin.png
Research1 required
Projectile created
Murasama Slash
Murasama Slash
Dropped by
Security Chest (Underworld Bio-center Lab)1100%
Not to be confused with Muramasa, a vanilla broadsword.

The Murasama is a post-Moon Lord melee weapon. It can be found in The Underworld's Bio-center Arsenal Lab, contained within a Security Chest.

Although Murasama is technically obtainable in Pre-Hardmode, it cannot be swung until The Devourer of Gods has been defeated in the current world. In this unusable state, it will have a "sheathed" appearance in which the blade is covered by a mechanical exterior.

After the Devourer of Gods is defeated, the item's appearance changes to reveal the glowing red blade, and it is now capable of being swung. While being swung, large red electric slashes will swing in the direction of the cursor, and any enemies that are hit by the slashes will take damage. The slashes appear in a set looping order: one large upward slash, one larger electrified upward slash, and then a slightly smaller downward slash. Every third slash deals 200% of the weapon's damage and has a larger hitbox. The Murasama emits bright red particles outward as it swings. It also possesses a larger than normal critical strike chance.

Its best modifier is Godly. It cannot get modifiers that affect size. Ruthless might be preferred if the player already has 100% critical strike chance.


  • The Murasama's small range makes it very difficult to hit most bosses with it, especially the bosses that follow the Devourer of Gods.
  • In the Get fixed boi seed, the Murasama receives a 200% size modifier, and it can deal damage immediately when used, allowing it to be spam-clicked for rapid damage.


  • The Murasama is a reference to a weapon of the same name and similar appearance wielded by the character Jetstream Sam from Metal Gear Rising: Revengeance.
    • The fact the weapon was "ID locked" is also a reference to Sam, for the inability of using his weapon immediately after defeating him, unlike the other bosses in Metal Gear Rising.
    • The weapon's tooltip, "There will be blood!", is a reference to the lyrics of "The Only Thing I Know For Real", which is Sam's boss theme, specifically the line "The only thing I know for real- There will be blood! Shed!"
  • The first frame of the Murasama's slash animation has a Crewmate from the game Among Us hidden in it.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Now uses the Rarity Level: 14 rarity instead of Rarity Level: 15.
    • Increased sell price from 30 Gold Coin to 40 Gold Coin.
    • Now has a larger hitbox during its third slash.
    • Decreased swing sound volume.
    • Resprited it and its slash.
    • Nerfed damage from 3001 to 2222, but buffed critical strike chance from 34% to 65%.
    • No longer has a 200% size modifer, but now grants 6 ID-static immunity frames instead of 21.
    • Every third swing of the blade now deals 200% base damage.
    • Now unlocked after defeating Devourer of Gods instead of Yharon, and can no longer be unlocked early by using certain player names.
    • Added new visual effects when hitting enemies.
  • Decreased sell price from 50 Gold Coin to 30 Gold Coin.
    • Now receives an additional damage bonus that scales with the player's melee swing speed stat with a 1:4 ratio.
    • Nerfed damage from 20,001 to 3001.
    • Changed the player-name usage check from "Sam" to "Jetstream Sam".
    • Fixed a drawing issue with projectile.
  • Now uses ID-static immunity frames instead of framing checks.
  • Fixed it being able to deal damage in the first 10 frames of its animation.
    • Buffed damage from 999 to 20,001.
    • Now swings slower but has a massively increased range.
    • Resprited.
    • Fixed glowmask affecting the entire item rather than just the blade.
  • Now benefits from true melee bonuses.
  • Buffed damage from 666 to 999, and gave it a 30% critical strike chance.
    • Decreased local immunity frames from 2 to 0.
    • Changed tooltip to say "ID and power-level locked. Prove your strength or have the correct user ID to wield this sword." instead of "Revengeance drop".
    • Can now only be used if Jungle Dragon, Yharon has been defeated or if the player is named "Sam" or "Samuel Rodrigues".
  • Increased size and it now grants 2 local immunity frames instead of 3.
  • Now grants 3 local immunity frames instead of 1.
  • Now completely ignores immunity frames instead of hitting every other frame.
  • Now grants local immunity frames instead of global immunity frames when hitting enemies.