|Type||Weapon – Crafting material|
|Use time||9 Very Fast|
|Tooltip||Fires a stream of short-range kunai|
Stealth strikes spawn 5 Cosmic Scythes which home and explode
|Inflicts Debuff||God Slayer Inferno|
|Debuff duration||1 second (Cosmic Scythe)|
|Debuff tooltip||Your flesh is burning off|
|Signus, Envoy of the Devourer||1||33.33%|
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 cause five Cosmic Scythes to release around the player alongside the kunai. The scythes will 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.
- 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.