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This jutsu, Chakra Dilation Seal, is the property of Ashy, and needs his explicit permission to be given to another user. Find me at my message wall to get this permission: I won't bite!'
The Chakra Dilation Seal (チャクラ散大封印, Chakura Sandai Fūin) is a Fūinjutsu practiced commonly by those of a Jōnin-level rank or higher, generally. By placing a technique formula with the kanji for Sandai (散大) on the enemy's skin, the seal can subsequently be activated through the use of the Ox, Monkey and Tiger hand seals. Upon doing so, the technique formula seeps into the opponent's skin, and subsequently the entirety of their Tenketsu begin to glow with a faint blue aura. At which, the effects of the technique begin.
By using their own, foreign chakra, the user causes it to flow through the exact center of each tenketsu in the opponent's body. In doing so, their own chakra stays at the edges, and thus "dilates" the chakra within the tenketsu, by making it cornered at an edge, so-to-speak. In turn, this makes it far more difficult to flow chakra within the body, mainly because the chakra is being interrupted by foreign chakra. Accordingly so, the opponent's techniques begin to weaken in overall power - sometimes they are completely negated. Everything that requires chakra by the opponent becomes extremely difficult to conjure, and therefore makes it almost useless to employ chakra in the situation. This provides the avenue for the user to make debilitating blows on the opponent, provided they aren't extremely skilled at Taijutsu, and turn the battle into their favor. However, the effect is only temporary, as the foreign chakra in the opponent's body is already diluted from being expanded from a single technique formula written by the user's chakra. Therefore, it is a technique recommended to bring about the final blow.
Trivia[]
The kanji used for dilation, Sandai (散大) is generally referred to as the dilation of the pupils.
