Listening to Gengetsu's explanation, Minato and Kushina were both left dumbfounded, utterly astonished. They had never expected Gengetsu to silently create a kind of talisman that had never existed in the Shinobi World before.
There were actually scrolls in the Shinobi World that could seal other ninjutsu. In the original story, Shikamaru had used Water Release sealed in advance inside a Sealing Scroll to deal with Kakuzu.
But those were Sealing Scrolls. Not only were they bulky and difficult to carry, their applications were far less versatile than explosive tags. But if they could be condensed to the same size as an explosive tag, that would be completely different!
Minato's instincts were incredibly sharp. He could not even be bothered to cook anymore and said directly, "Let's go to the training ground and try it out!"
Without waiting for Gengetsu to nod, he immediately brought the two of them to a marked training ground with the Flying Thunder God Technique.
Gengetsu did not say much either. He simply set up a rudimentary trap between two trees and suspended the Thunderstorm Tag in midair with thin iron wire.
After retreating ten meters from the trap, he raised one hand. "Explode!"
The next moment, before Minato and Kushina's eyes, the Thunderstorm Tag hanging in midair split apart and transformed into a lightning sphere the size of a fist. Then bolts of lightning burst outward in every direction, forming an all-encompassing lightning field that covered a spherical space ten meters in diameter.
Minato keenly noticed that when the lightning struck the trees on either side, their bark immediately burst apart, leaving charred black wounds. Clearly, the lightning it released was no weak force. Someone caught within the lightning field might not be electrocuted to death, but unless they were skilled in Lightning Release