The core of Sunagakure's Sand Control Secret Technique was—Fuinjutsu!
So that was it!
Aoba immediately understood.
He silently cursed himself. He had not expected to be influenced by a fixed mindset as well.
Because he had studied Medical Ninjutsu, he had only thought of solving the problem through medical methods.
Perhaps that was the curse brought by knowledge.
He would have to watch out for this in the future. Aoba gave himself a silent reminder.
Still, Aoba could not help admiring the person from Sunagakure who had created it.
Sunagakure's Fuinjutsu was practically at the bottom among the Five Great Shinobi Countries. Konohagakure had inherited the Uzumaki Clan's legacy and possessed high-level techniques like the Four-Symbols Seal and the Dead Demon Consuming Seal, while Sunagakure was dirt poor.
They had all plundered the Uzumaki Clan's Fuinjutsu, yet the other villages had only considered how to use it to seal their own Tailed Beasts. Sunagakure, however, had used its rudimentary knowledge of Fuinjutsu to piece together a secret technique comparable to a Kekkei Genkai.
The person who had created the Sand Control Secret Technique truly had been a genius.
However, while the principles behind the Sand Control Secret Technique seemed simple, the practical requirements were extremely demanding.
First, the user needed a certain degree of chakra control—at least the level of a medical ninja. Second, they needed enough talent in Fuinjutsu to seal their chakra into tiny grains of sand.
Those two requirements alone eliminated the vast majority of Sunagakure's ninja.
That was why, despite being Sunagakure's signature secret technique, so few people could truly use it.
Most merely used sand control as an auxiliary ninjutsu.
No wonder Gaara could use a large-scale sealing technique like the Desert Layered Imperial Funeral Seal even when he was not in his Jinchuriki state.