Black Zetsu's first act was to manipulate Indra to "reclaim" his inheritance from Asura. So its caused the entire Uchiha-Senju feud that lasted for about 1,000 years. Constantly trying to manipulate Indra's chakra hosts into taking in the DNA of Asura' chakra host, so that they could awaken the Rinnegan. Black Zetsu failed for nearly 1,000 years in doing this. To help its plans, it also altered the Naka Shrine Tablet to change the text that would not only give intel on how to cast Infinite Tsukuyomi, but encourage one to do so. Black Zetsu watched Madara from the shadows, hoping that Madara could be the one to awaken the Rinnegan and initiate its plan. Indeed, Madara did so, and after Madara broke the seal on the Gedo Statue and fell for Black Zetsu's plan, Black Zetsu tricked Madara into