The foundations of Kurozome can be traced back to the Fourth Shinobi World War, among the ranks of the countless, faceless shinobi who had to face the resurrected Shinju, courtesy of Obito and Madara Uchiha. The display of the Ten-Tails' power and the truth about its origins caused many of the shinobi to start viewing him as some sort of deity and soon the belief spread like wildfire among the people, soon blossoming into a full-fledged religion.