Shindai-Akuma is another very powerful bloodline that is known for its clone-creating capabilities and large AOE attacks. You might be reading the Shindai prefix and thinking it is connected to the Shindai-Rengoku, which is somewhat correct. While the Shindai-Rengoku references Madara Uchiha’s Rinnegan, Shindai-Akuma references Madara Uchica’s Mangekyo Sharingan, an equally powerful eye technique (if not more).