- Name- Third Tail Style: Hardened Skin Shield (Sanbi Kata: Nikui Kawatoku)
- Type- Water
- Hand Seals- Tiger, Bird, Snake
- Users- Rikudoi Sennin, Pain (presumbed), Keigai Honrui
A technqiue developed by Rikudou Sennin that let him take advantage of the Sanbi's hard and dense skin. This technqiue will create a layer of green skin over the user that is as hard as the Sanbi's. It can hold back most attacks and is strong, being able to take a full Rasengan at most. It can also be used to create a giant shell over the user that will block at a 360 degree angle. It is mainly used for defense and had no specific duty.