The Cosmic Kunai in use.
The Cosmic Kunai is a post-Moon Lord rogue weapon 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 curve toward nearby enemies.
Its best modifier is Unreal.
- 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.
- Due to its high rate of fire, this weapon has great synergy with the Luxor's Gift.
- 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.