Yanmei's Knife

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Cosmic Plushie.png
Cosmic Plushie.png
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This item is dedicated to: Kamei
Yanmei's Knife
  • Yanmei's Knife.png
Stack digit 1.png
Knockback4.5 (Average)
Critical chance6%
Use time32 Very Slow
TooltipEnemies you hit are crippled
Hits will also give you enhanced movement speed and damage for 10 seconds
'A knife from an unknown world
An owner whose heart is pure and free of taint
A heart of iron and valor'
Grants BuffKami InjectionKami Injection
Buff duration10 seconds
Buff tooltip15% increased max movement speed, acceleration and damage
Inflicts DebuffKami FluKami Flu
100% chance

Debuff duration10 seconds
Debuff tooltipDefenseless and dying
RarityRarity Level: 8
Sell 12 Gold Coin.png
Research1 required
Projectile created
Yanmei's Knife Slash
Yanmei's Knife Slash

Yanmei's Knife is a craftable Hardmode classless weapon. When swung, a short-ranged green slash appears in front of the player towards the mouse cursor. After the swing, the player is temporarily unable to use the weapon for 3 seconds. Striking an enemy grants the player the Kami Injection buff while the hit target is inflicted with the Kami Flu debuff. Kami Injection grants the player 15% movement speed and damage, while Kami Flu reduces the enemy's damage reduction by 20% and depletes 125 health per second. Both effects last for 10 seconds. Players with the Kami Injection buff will have a trail of green afterimages, while targets inflicted with the Kami Flu debuff will emit a green glow.

The Yanmei's Knife cannot be reforged, and therefore cannot have modifiers.




  • Yanmei's Knife does not gain any critical strike chance from accessories, modifiers, and armor bonuses.
  • When the knife successfully hits a vulnerable NPC, it will play the same sound as activating Adrenaline Mode.


  • Due to the weapon's low direct damage and the significant stats of the buff and debuff, Yanmei's Knife should not be used as a primary damage-dealer and instead functions better when used periodically, to refresh the buff and debuff.


  • The weapon is a reference to Automaid, a work-in-progress comic series being illustrated and written by the dedicatee. The knife is the signature weapon of the main character, Yanmei, with the Kami buff and debuffs playing a key role in the comic.
  • The tooltip is part of a poem by Piky, one of the beta testers and developers for the mod, written to describe Yanmei:
  • A voice, a strike of caring humor
    Sparking dear memories
    Of sweetened & pure serenity
    Memories of the Days of Old
    Yet, profoundly reassuring
    Her voice calls to the fire
    Dancing until the break of dawn
    Of her deeds alone, instilling within her friends
    A heart of Valor

  • History

    These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Fixed Kami Flu's NPC color drawing not functioning properly.
    • On-hit effects now work on all enemies instead of only bosses.
    • Introduced sound effects on hit and when the buff expires.
      • Specified in Kami Injection's tooltip that it increases acceleration and max movement speed instead of just movement speed.
      • Kami Flu now grants a 30 second global cooldown on bosses before they can be slowed again.
      • Kami Injection buff no longer grants bonus defense. Nerfed damage boost from 30% to 15%. Buffed movement speed boost from 10% to 15%. Decreased Kami Flu debuff damage over time from 125 damage per second to 100.
      • Can now trigger its on-hit effects when damaging the following:
        • Armored Digger, Betsy, Cloud Elemental, Colossal Squid, Cragmaw Mire, Earth Elemental, Eidolon Wyrm (Juvenile), Everscream, Giant Clam, Great Sand Shark, Ice Queen, Mauler, Mothron, Mourning Wood, Nuclear Terror, Plaguebringer, bees summoned by Plaguebringers, Pumpking, Reaper Shark, and Santa-NK1.
      • Can no longer trigger its on-hit effects on Ceaseless Void or The Devourer of Gods' body segments.
      • Fixed an exploit with Kami Injection that allowed it to incorrectly stack with Titan Scale.
      • Fixed an exploit with Kami Flu that allowed the player to see Duke Fishron at all times during its third phase.
      • Can now trigger on-hit effects when damaging the following:
        • Ancient Doom, Ancient Light, Cosmic Mine, Cultist Clone, Dark Heart, Detonating Bubble, Moon Leech Clot, Plaguebringer, Plague Charger, Probe, Ravager's Right Leg, Sepulcher Heart, Sharkron, and Soul Seeker.
      • Fixed it not using the Any Iron Bar recipe group.