The Rainbow Tower is a device made possible by Henzo thanks to the taxes gained by Wetton. It took 50 years to build. It is an enormous tunnel device with the sole purpose to link Ruluka with the Rainbow Mist. With it, Wetton hopes to take all the treasures in Ape's Concert. But when Luffy arrives to stop him, he decides to destroy Rainbow Tower by making it explode, leaving his family, the Straw Hat Pirates and the Pumpkin Pirates into the Rainbow Mist.