Therefore, Hagoromo chose his kind-hearted second son, Asura, as the heir to Ninshu.
Although Asura's strength was far inferior to Indra's, he placed greater value on companions and unity, which better matched Hagoromo's hopes for Ninshu's future.
However, this decision caused a massive internal split. Indra and his supporters believed that the eldest son's status should be respected, and Hagoromo's decision to pass over the elder in favor of the younger aroused their dissatisfaction.
After Hagoromo's death, Ninshu quickly split into two major factions: one supported Asura, while the other followed Indra.
This division led to internal strife that continued for hundreds, even thousands, of years.
Asura's descendants gradually evolved into the Senju Clan and the Uzumaki Clan, while Indra's descendants formed the Uchiha Clan.
The conflict between the descendants of the two factions never ceased within the Ninja World, continuing into the later Warring States Era.
Yet this conflict did not end with the two brothers' deaths.
Their chakra reincarnated, and Indra and Asura were continually reborn to carry on their struggle. Their conflict never ceased over the millennia, and peace in the Ninja World was therefore never fully realized.
After reading this series of historical records, Ying Yue's heart churned with emotion.
The Ninja World's bloody history and the curse of reincarnation had plunged this land into endless strife for a thousand years.
As Ying Yue studied the ancient history preserved by the Moon Otsutsuki Clan, he gradually discovered a deeper issue: the Sage of Six Paths had not only made a controversial decision regarding his successor, but had also divided the mighty Ten-Tails. Though his intentions had been kind, that decision had caused even more complicated consequences for later generations.
The Sage of Six Paths had realized that the Ten-Tails' power was far too vast and dangerous.