Ch. 601Engraving the Yin Seal
Hyuga Seisen devised a way to use Shadow Clones to maintain a village-wide Flying Thunder God barrier by giving them Yin Seals as chakra reserves. After his first attempt to inscribe a seal destroyed a clone, he used microscopic Byakugan control and Reishi to successfully engrave a Yin Seal on one, leaving the plan within reach.
- Hyuga Seisen proposed equipping Shadow Clones with Yin Seals so they could sustain the Flying Thunder God Formation, and Minato Namikaze agreed to prepare a barrier covering Konoha.
- Minato left to inspect hidden nodes across the village and gather materials for the formation while Seisen studied Tsunade's Yin Seal notes.
- Seisen's first attempt to inscribe the Yin Seal with chakra caused his Shadow Clone to burst.
- One month later, Seisen used the Byakugan and a finely controlled Reishi Light Needle to engrave the seal without disturbing the clone's chakra.
- A diamond-shaped purple Yin Seal appeared on the unharmed Shadow Clone, confirming Seisen's method had worked.