Calamity Mod Wiki
Cosmic Kunai
  • Cosmic Kunai.png
Stack digit 1.png
TypeWeaponCrafting material
Damage92 Rogue
Knockback5 (Average)
Critical chance4%
Use time9 Very Fast
TooltipFires a stream of short-range kunai
Stealth strikes spawn 5 Cosmic Scythes which home and explode
Inflicts DebuffGod Slayer InfernoGod Slayer Inferno
100% chance

Debuff duration1 second (Cosmic Scythe)
Debuff tooltipYour flesh is burning off
RarityRarity Level: 12
Sell 24 Gold Coin.png
Projectile created
Cosmic Scythe
Cosmic Scythe
Dropped by
Signus, Envoy of the Devourer133.33%

The Cosmic Kunai in use.

The Cosmic Kunai is a post-Moon Lord dagger dropped by Signus, Envoy of the Devourer. It rapidly fires a stream of quick-moving, short-range kunai that pass through tiles and are not affected by gravity. The kunai turn transparent as they travel; however, this does not affect their damage and is only an aesthetic addition. The kunai also very slightly curves toward nearby enemies.

Performing a stealth strike with the Cosmic Kunai will deal 321% damage and cause five Cosmic ScytheCosmic Scythes to release around the player alongside the kunai. The scythes will each deal 256.8% damage, linger if no enemies are nearby, sharply home onto enemies, and erupt into an explosion that inflicts the God Slayer Inferno debuff.

Its best modifier is Flawless.


Used in

ResultIngredientsCrafting station
Time BoltTime BoltAncient ManipulatorAncient Manipulator
total: 1 row(s)


  • The Cosmic Kunai's incredibly high single-target damage has limited usefulness against fast bosses like Storm Weaver and The Devourer of Gods; conversely, the Cosmic Kunai is quite effective versus Blood Moons and other buffed Calamity events due to its strong single-target damage.


  • In the real world, a kunai is a 14th century Japanese farming tool. Since then, the knife-like shape of the kunai has led to its common depiction as a weapon used by ninjas and assassins.
  • This weapon functions very similarly to the Mycoroot.