"Indra, whose Sharingan had evolved, destroyed the village and even wanted to kill everyone. Under such circumstances, the two brothers naturally broke out into a fierce battle. In the end, the younger brother, Asura, achieved a breakthrough and defeated his elder brother, Indra."
"Then, under the instigation of certain schemers, Indra's Chakra was reincarnated. To prevent his elder brother from causing trouble again, Asura chose the same method. Driven by this, their descendants—the Uchiha and the Senju—became mortal enemies for generations, fighting and harboring grudges against each other generation after generation. In truth, the First Hokage and Uchiha Madara were the reincarnations of Indra and Asura's Chakra."
"And the original user of Wood Release was not the First Hokage, but Asura. Those who inherited Asura's Chakra seemed to awaken the secret technique known as Wood Release."
"There was another reason Uchiha Madara could use the First Hokage's Wood Release. Compared to Wood Release, something else was even more important."
As he spoke, Ronglin pointed to the corner of his eye. Minato exclaimed, "The Rinnegan?!"
"That's right!"
Ronglin nodded. "It was the Rinnegan. For an Uchiha to obtain the Rinnegan, they needed the First Hokage's cells. Put simply, Indra and Asura's Chakra had to merge. Uchiha Madara transplanted Hashirama Senju's cells, causing his Sharingan to evolve into the Rinnegan. During the battle at the Valley of the End, Uchiha Madara did not die. He used an Uchiha Forbidden Jutsu to deceive everyone, then left Konoha and transplanted Hashirama Senju's cells."
"And so he obtained the Rinnegan. Naturally, transplanting Hashirama Senju's cells also allowed him to use the secret technique, Wood Release."
"..."
At that moment, White Fang, Minato, Itachi, and even Kimimaro were all somewhat stunned. They had never expected a secret technique like Wood Release to uncover such unknown events