Ryūsui

Ryūsui (流水, Flowing Water) is an Ninjutsu created by Heiwa Uchiha based on the famous technique of the Fourth Hokage: The Rasengan. The user forms a sphere of water in their hands, which is then thrusted towards the opponent for various effects.

Usage
Kneading the required seals, Heiwa manifests a sphere of water through gathering (O2) and  (H2) from the atmosphere. This sphere is then applied with Yin Release, which allows one to create form out of nothingness by using their imagination. This yin allows Heiwa to bend the sphere and it's effects to his every whim, only limited by his own imagination. Heiwa can heat the sphere to beyond boiling levels without evaporating it, or apply extremely cold temperatures without freezing the sphere. This allows these effects to be applied internally into the target once the sphere connects, either freezing them from within or boiling their internal organs. Additionally, the user can multiply the density of the sphere tenfold without even freezing, leading to a powerful explosion as that density is applied to the target internally. The sphere has shown incredible durability akin to the Water Prison Technique, and has even withstood the full brunt of it's larger and stronger versions of it's parent technique. Additionally, due to it being comprised of Yin, Heiwa is able to apply a powerful illusion to those struck by the technique, which can allow him to deal extra damage or gain time for the effects to take place without struggle from the target.