After a trip to the ruins of the land of sky a scientist by the name of Arian Sen found a fragment of the Noh-Mask that was said to have belonged to the Zero-Tailed Masked Leech. After long studies he realized that if he could harnessed its power he could grow stronger then before. Upon doing more research he discovered that the dark chakra would eventually corrupt the human mind. Overwhelmed buy the foul chakra of the beast many of the scientist begin to flee other attempted to subdue it, but was killed by it. Upon his dying breath Arian dubbed the beast "Zenaku".