Blood Rain Bow

The Blood Rain Bow is a pre-Hardmode bow which rains 1-3 streams of blood from the sky, rather than arrows. Each shot consumes one arrow from the player’s inventory. The streams fall in a widespread area where the cursor is pointed, but are blocked by solid blocks. It has a 2.2% chance to drop from a Wandering Eye Fish and Zombie Merman.

Trivia

 * The tooltip might be a reference to the album "Reign in Blood," or the song "Raining Blood" from the same album, by the thrash metal band.
 * The bow can be considered as a pre-Hardmode counterpart to the Daedalus Stormbow due to their similar ability to shoot projectiles from the sky.