The Rainbow is Crono's most powerful weapon in the SNES/PSX versions of Chrono Trigger. It is forged by Melchior using the Rainbow Shell and Sun Stone. When equipped, the sword is pinkish-blue. On a critical hit, a radiant rainbow trails off the blade. It critical hits 70% of the time and its attack power is 220. Paired with the Prism Spectacles, Crono will annihilate the battlefield with mere basic attacks that turn into frequent critical hits.
The weapon/blade's sprite is of a silver-white color shared with the Silver Sword, Thunder Blade, Primeval Blade, Slasher, Slasher II and Onimaru. However, the slashing trail is a uniquely-colored trail of white with blue-and-pink outer-ends mixed together, akin to the color of the Rainbow Shell.