Prism Rain

Prism Rain is a Shotlock that is exclusive to Aqua in Kingdom Hearts Birth by Sleep. This Shotlock is similar to Ragnarok, but instead of beams of light, it shoots out rainbow-colored beams. A salvo of rainbow-colored orbs are shot out of the Keyblade, extra attacks can be triggered by pressing at the correct time interval to fire additional projectiles.

Etymology
A prism is a small glass that is used in science to reflect light at an angle until it's to the point where the light splits up into 7 different colors.

Location
Prism Rain is located in a chest in the Ship Hub in Deep Space.