Eight Trigrams Sealing Style

The Eight Trigrams Sealing Style, consisting of two Four Symbols Seals, was used by Minato Namikaze to help Naruto Uzumaki access the chakra of Kurama, the tailed beast sealed within him. To perform the technique, the user must first summon a ceremonial throne and place the target on it. The seal was not automatically visible on Naruto's belly, but became perceptible whenever he drew Kurama's chakra.Because the seal itself would naturally weaken over time, Minato, before his death, created the key, on the abdomen of the scroll toad Gerotora, that can either strengthen or completely remove the seal. He gave it to Jiraiya for safekeeping, with an intention to give it to Naruto by the time he would need Kurama's power to fight against Tobi