Middle Warring States Era,
With their newfound visual prowess, the Hagoromo clan steadily rose to power.
Soon, they forged a distinct identity for themselves and truly separated themselves from the brand of the Uchiha branch family.
Genreigan identified itself as a superior Dojutsu, surpassing even the Sharingan and the Byakugan. The ability of the Genreigan to cast an extremely powerful genjutsu and strip the senses of their enemies made it a powerful tool of war.
Even the main family of the Uchiha clan had to recognize its power and extend a friendly gesture to the Hagoromo clan. Thus, the severed relationships between the two clans were restored.
As a friendly gesture, the women of both clans married to man of other clan. This not only maintained their friendly ties and forged familial bonds but also maintained the Uchiha blood among the members of the Hagoromo clan.
The next-generation leader of the Hagoromo clan suggested the inter-clan marriage. It was an effort to maintain a certain level of Uchiha blood among the Hagoromo clan progeny and was secretly suggested by Black Zetsu.
Despite their close relationships, the Hagoromo clan closely guarded the secret of their 'Dojutsu', never revealing its true nature to outsiders. Only a few elders were aware of the secret and even then, only the current generation of clan leaders knew the formula for the 'Bloodline Pill'.
The Uchiha clan tried to probe the secret through overt and covert methods, but was always disappointed. The Hagoromo clan elders secretly manipulated the memories of the Uchiha women who married into the Hagoromo clan to prevent them from leaking their secrets.
The Hagoromo clan elders deceived not just outsiders but also their clan members. Once the Hagoromo clan had a firm footing, they controlled the number of 'Genreigan' being awakened within the clan.
The conditions to awaken the 'Genreigan' were harsh. But over a span of several decades, the clan elders had figured out some prerequisites to awaken these eyes.
Of course, Black Zetsu secretly provided such information to them. Black Zetsu provided them with such crucial information, not because he cared for them.
On the contrary, he lost interest in the Hagoromo clan after his research results were met. Still, the members of the Hagoromo clan were like wild mutts, slaughtering the Senju and Uzumaki clan members to turn their blood into pills.
This development greatly stoked him since it delayed the reincarnation of the Indra and Asura. So, he secretly manipulated the elders of the Hagoromo clan.
The bloodline of the Hagoromo clan must reach a certain threshold if they want to awaken the 'Genreigan'. Below it, they would never awaken the Dojutsu and the bloodline pills would not only affect them but also cause harm.
Thus, to preserve their members, a certain bloodline ceremony was carried out by the elders of the Hagoromo clan to test the bloodline purity of the clan children at the age of ten.
The children who passed the test were nurtured into elites. These elites underwent special training and were secretly given 'Bloodline pills' to awaken their Dojutsu.
This information was hidden from the rest of the clan members and thus, over the course of several decades, the members who knew the secret of 'Genreigan' were few and far.
The hatred between the Senju and the Uchiha clan continued to persist, even after several centuries of conflict.
However, despite their differences and grudges; the two clan leaders stretched a hand of friendship towards each other.
Well, to be exact, it was Hashirama Senju who pummeled some sense into Madara and even reached to him and stood with him, standing against the wish of his clan members to protect him.
Thus, the long-seated grudge of the two clans was finally quelled despite the deep hatred and protest of their clan members.
However, the members of these two clans were helpless against the overwhelming power of their clan leaders. Hashirama and Madara single-handedly subdued their respective clans into submission.
While it was easy for Hashirama to convince his allies since his wife, Mito Uzumaki, was the daughter of the Uzumaki clan leader. Mito Uzumaki stood with her husband and supported his decision. And Hashirama was already a revered figure in both Senju and the Uzumaki clan.
On the contrary, the path to unification wasn't easy for Madara. The power dynamic of the Uchiha clan and the Hagoromo clan was much different from the Senju and Uzumaki.
While Senju and Uzumaki clan were mostly based on co-operation and teamwork among clan members, individual power was more prominent in the Uchiha and Hagoromo clan.
There was a clear distinction between the elite and commoners in the Uchiha and the Hagoromo clan. Only a few shinobis with their clan's Kekkei Genkai were among the elite members. These elite members were prideful, having achieved their current power solely on hard work without any support from other members.
The Uchiha clan had two such promising members, Madara Uchiha and the Hikaku Uchiha. Madara proved his superior prowess and thus became the leader of the Uchiha clan.
So, during the process of unification of clans to form a village, a few discontent voices emerged. Hikaku Uchiha was also among them. These discontent Uchiha members left the village and settled in the Valley of Flowers.
On the other hand, the Hagoromo clan was an entirely different case. They vehemently opposed the idea of any alliance with the Senju and the Uzumaki clan. While the common members of the clan were in support of the alliance, the elite few who knew the secret of their Dojutsu were against it.
Madara faced a severe challenge- a challenge to unify his allies. He confronted the stubborn Hagoromo clan members and failed to convince them.
In the end, the Hagoromo clan broke their several centuries of agreement and separated themselves from the Uchiha clan Alliance.
They found a settlement in the Land of Waves, a small island country adjacent to the Land of Fire.
The Uzumaki clan also followed a similar sentient. Though they were supportive of the Senju clan in their alliance with the Uchiha clan, they didn't share the idea of living in the same village as the Uzumaki clan. Thus, the Uzumaki clan found their village on a small island nation in the Land of Whirlpool.
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