The Hydration Technique is a hidden ninjutsu of the Hozuki clan, allowing the user to turn any part of their body into a liquid state at will. The transformation occurs automatically and does not require conscious control: upon receiving a physical blow, the attacked area instantly becomes liquid, letting damage pass through the body without any harm, after which the limb regains its solid form.
Besides defense, the liquid body opens up wide possibilities for covert infiltration into buildings and silently sneaking up on targets. Clan members are able to force water into their muscles to increase physical strength, release water bullets from their fingers as an attack, or use their own body to drown the opponent. Gengetsu Hozuki secretes oil, but it is unknown whether this trait applies to other clan members.
Despite the versatility of the liquid form, the technique has a critical vulnerability: it is extremely vulnerable to the Lightning Element. If an attack overwhelms the user and they lose consciousness, their body takes on a jelly-like state. Furthermore, a Hozuki placed in a sealed container loses the ability to move and escape.
