- If you were looking for something other than the magic weapon, see Cosmic (disambiguation).
The Cosmic Rainbow is a craftable Hardmode magic weapon. When fired, it spawns 3 rainbows in the direction of the cursor in a similar manner as an arrow flying out of a bow. Additionally, 2 more rainbows fall from the sky at random locations within the vicinity of the cursor. These rainbows deal constant damage to any entity that collides with them.
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- Despite having the appearance of a bow, the weapon uses mana and deals magic damage.
- Although this is a magic weapon, it essentially behaves like a Sentry due to the long lasting effect. This allows all classes to use it to increase their DPS.