They couldn't bear to let those test subjects die just yet.
To make the most of these materials, the members of the Research Department had no choice but to study resurrection technology. Fortunately, life and death were rather blurry concepts in the Ninja World, and there were even rudimentary techniques that could serve as a foundation for resurrection.
Techniques involving the soul, such as the Spirit Transformation Technique, Impure World Reincarnation, and Reaper Death Seal, gave the researchers something to work with. By studying these Ninjutsu, they successfully developed a Sealing Jutsu that marked a person's soul. Once the body was too damaged to sustain the soul, the seal would transfer the test subject's soul into a special vessel.
After repairing the body, they could stuff the soul back inside and continue their experiments. It was quite cost-effective. In fact, this technique was the main reason the Research Department hadn't exhausted its supply of human test subjects.
The technique was called the Soul Resurrection Technique.
In theory, as long as they had a body and a soul, they could resurrect a living being an unlimited number of times. They could even put different souls into different bodies.
Sigh, nobody had it easy. If people in Konoha were constantly committing capital crimes, would they have needed to develop a technique like this?
It was too difficult!
Well, actually, cases where they killed their test subjects were relatively rare. After all, with Ex Vivo Organ Preservation Technology, they could simply remove damaged organs, grow replacements, and repair the body.
"This technique..."
Uchiha Kazuto looked over the information on the technique. The more he read, the more inspired he felt.
"Wait. What if I found a special soul vessel that could absorb a person's soul after death? Then, using a Clone Cultivation Body,