Owatatsumi

Owatatsumi, also known as Ryujin, the Dragon God of the Sea, is a rare ability granted to those who have unlocked both of the abilities of their Mangekyō Sharingan. Upon activation, the technique will cause a massive surge of water to form around the user in the form of a dragon much larger than this one. Much like most Mangekyo Sharingan techniques, using this techniques drains the users chakra at a high rate, and could endanger their life if overused.

Usage
With the Sharingan eyes acting as the Magical Tide Gems this Kami was revered for, the Left (Pulls) while the Right (Pushes), the absolute power over water is attributed to the user. With the eyes working in perfect synchronization, the user is able to revert ice back into water, mist into water, and remove the water in plant life with extreme ease. Pulling water from the very air becomes near immediate and around large bodies of water only increases the amount of difficulty an opponent will have with the user.

While water is the main focus, if the user can, they can use these eyes for a more nefarious style of Ninjutsu. This can be simplified as Blood Release and they would find their connection to the blood heavily strengthened and the movements becoming just as sharper.

If one possesses Sage Mode, the power of the technique increases exponentially and the drainage of chakra is lessened. If a user was to activate this technique and ascend those eyes to their Rinnegan then the strength of the technique is doubled through unknown means.

Depending on the creativity of the user, anything is possible through this technique. Whether they want the water to put out high-pressure force that can even slice through metals and granite. Or, they can make a overwhelming force route and form a tsunami. Those are just examples to the endless possibilities that can be done with the active technique.

Weakness
Owatatsumi has an obvious weakness in being severely weakened in locations where the air is entirely too dry, like the desert. If the user wants to force things, they can use more chakra to make up for the handicap, but doing this can even cause a Jinchuriki to breath heavily from the energy loss.


 * A way around this is to provide your own water, like Jay Nara has with this.

But, even this has it's limits as the water would rapidly become reminiscent to mud as it mixes with the sand. Removing the liquid properties from the soft earth will quickly use up more chakra as well.

If either eye is covered in any sort of fashion, like an eye patch, or an eye has been lost or sacrificed then the technique is rendered completely useless.