Kura was a treasure the Otsutsuki had left behind in the shinobi world, capable of traveling across timelines.
Zou Hyuga did not know what consequences changing the past would bring. But in the original history, the Sunagakure ninja who had traveled into the past and become Anrokuzan had ultimately died there from the backlash of space-time.
However, Zou Hyuga was not using the Sacred Treasure Kura to change the past, but to strengthen his connection to the shinobi world.
The instant Isshiki sensed the Sacred Treasure Kura, his expression darkened, all his earlier composure gone.
Clearly, Isshiki also knew the uses and drawbacks of the Sacred Treasure Kura, and understood how steep the price of traveling through time and space could be. Otherwise, he would have used the Sacred Treasure long ago to return to the past and prevent Kaguya's attack on him.
"Trying to persuade me not to use this Sacred Treasure?" Zou Hyuga asked, seeing through Isshiki's thoughts.
Isshiki said grimly, "This isn't a Sacred Treasure you can control. Recklessly changing history could have unimaginable consequences in the present. It might even destroy the shinobi world!"
Zou Hyuga smiled. "What does it matter to me whether the shinobi world is destroyed?"
"You're becoming more and more like an Otsutsuki, Zou..." After a moment's thought, Isshiki tried to reason with him. "But if the shinobi world is destroyed, what will happen to that Uchiha who likes you? She's no Otsutsuki."
Isshiki was rather afraid that Zou Hyuga would misuse the Sacred Treasure Kura and die from the backlash of space-time.
After choosing to reincarnate of his own accord, Isshiki's life had become bound to Zou Hyuga's. If anything happened to him, Isshiki's life would end as well.
With a noncommittal smile, Zou Hyuga blocked out Isshiki's voice in his