Sage Chains Seal

Sage Chains Seal (セージチェーンシール,Sējichēnshīru) is a unique Fūinjutsu developed by the Second Uzushiokage Shenron Uzumaki. The Seal was used to seal Son Gokū into himself.

Overview
Taking part in the Seven Labors of Uzushio Shenron needed a seal to capture and restrain a Tailed Beast. After days of thought and trial and error Shenron developed a seal that would use the powers of his sealing chains along with his knowledge of other Uzumaki Fūinjutsu to seal the Tailed Beast inside of him. Inside of Shenron's body, Son Gokū appears to chained to a wall, not allowing him to move. These chains slowly absorb Son Gokū's chakra for Shenron's own personal uses. Though while this is a very strong seal, it is not perfect. As Shenron's own chakra begins to fade and he become more reliant on Son Gokū that chanin tighten, then loosen slightly allowing Son Gokū more movement. Son Gokū believes soon enough the chains will break and he will be free.