As for the next forbidden jutsu, the Reaper Death Seal, Yechen did not study it in greater depth.
The idea that the Shinigami was a spiritual entity born from humans practicing Senjutsu was only a conjecture of his. Besides, he did not dare practice this forbidden jutsu lightly, as a mistake could bring trouble upon him.
He might as well wait until his strength transcended this world before trying it.
Then there was the Impure World Reincarnation Jutsu. This forbidden jutsu was incomplete, with many aspects still unverified, and required extensive experimentation and research.
What Yechen intended to do now was draw on this knowledge to develop new ways of using the forbidden jutsu.
He could not use living people as sacrifices for his research. Instead, he wanted to find other things to use as substitutes, perfecting the forbidden jutsu and perhaps even allowing someone to truly be reborn.
It would be a long road, but Yechen believed that as long as he kept researching, the system would give him direction. And so, research into this Ninjutsu was added to his agenda from that moment onward.
Seven days passed in a flash.
Yechen remained immersed in his research. Though he had made no major breakthroughs, there was one piece of good news: the forbidden jutsu, Impure World Reincarnation, had finally appeared on his skill page.
It was only level 1, and progress was slow, but this was a good start. He believed that when the day of its evolution arrived, this forbidden jutsu would undergo tremendous changes.
What surprised Yechen was that after so many days, Minato Namikaze still had not sent any word, as though he had forgotten the interception plan they had agreed upon.
Yechen did not believe that the Anbu had failed to uncover even a trace