As one of the three fundamental Kido arts, Kaido differed greatly from the other two.
Besides placing excessively high demands on its practitioners, it also suffered from the lack of high-level Kaido spells.
Coupled with the Department of Research and Development's advances in fields such as human creation, Kaido seemed even less useful than Bakudo and Hado.
"I suddenly thought of something."
As Su Feng attempted to practice other Kaido techniques, he glanced to the side and said, "The Department of Research and Development has developed more than one kind of injury-recovery medicine. Haven't they tried developing Spiritual Pressure recovery medicine?"
Seinosuke Yamada wiped away the bloodstains and habitually turned to search through the stacked files for an answer. Soon, several documents were placed on the table.
"They have. Not only the Department of Research and Development and Squad 12—even quite a few people in the Fourth Division have tried it. Even the Captain-Commander has attempted related research."
Realizing that Su Feng had no interest in the documents, Seinosuke Yamada shrugged and patiently explained.
"Actually, the rate at which Spiritual Pressure recovers is tied to the essence of the soul. Research in this area has only gone as far as modifying souls and Gikon Technology."
"The foremost expert in this field is none other than Lady Kirio Hikifune."
Even someone as sharp-tongued as Seinosuke Yamada showed respect toward Kirio Hikifune, who had been promoted to the Royal Guard and possessed a cheerful, friendly personality.
"At present, the only way to restore Spiritual Pressure is to use Kaido to stimulate it."
"For example, Lord Tenjiro Kirinji's Hot Spring Therapy."
Su Feng nodded slightly. Hot Spring Therapy appeared to treat injuries much like medicine, but in truth, both White Bone Hell and Blood Pond Hell were fundamentally Tenjiro Kirinji's Spiritual Pressure.
It