"All right... let's begin the next experiment..."
Orochimaru slowly raised both hands and began forming hand seals.
After Otogakure was established, many children were summoned by Orochimaru and joined the village.
There were also those who came in pursuit of power.
And those who could no longer survive on their own.
Orochimaru recruited and collected all kinds of talents.
They became his utterly loyal subordinates... or test subjects.
Orochimaru had even planted Spy Ninjas such as Akado Yoroi and Tsurugi Misumi in Konoha.
Besides that.
Orochimaru was also in contact with several wealthy merchants, making it convenient for him to obtain information.
It could be said that Orochimaru's contacts and research were extremely broad.
At present.
What Orochimaru was doing
was casting the S-Rank forbidden technique known as "Impure World Reincarnation."
Impure World Reincarnation was a forbidden technique developed by the Second Hokage, Tobirama Senju.
The technique could summon the souls of the long-dead back to the world of the living and revive them in physical form.
The technique required several conditions:
1. A certain amount of DNA from the "deceased" was required. Anyone who did not meet this condition could not be reincarnated.
2. A living person had to be used as a sacrifice, serving as the vessel for the person being reincarnated.
3. The soul of the person being reincarnated had to be in a free state. If it was in the Shinigami's stomach or sealed by another technique, reincarnation was impossible.
The first condition was easy to satisfy. If Orochimaru wanted to "revive" someone, he would naturally obtain blood and tissue samples.
As for the second condition, living sacrifices were also easy to acquire.
The one thing this world never lacked was people.
For example... the Land of Fire had a population of over one hundred million.