Forbidden Ninjutsu was like a switch that opened Pandora's Box.
While ninjutsu itself was powerful, it carried considerable side effects. Everyone only treated it as a secret weapon and would not use it on a large scale. No one was willing to casually give up their life.
Konoha, situated on the battlefield, received both good news and bad news.
The good news was that the other side had not used Forbidden Ninjutsu. Uchiha Yuu merely treated this ninjutsu as a prized possession, and it also held significant research value. However, the monsters it summoned would not play a decisive role on the battlefield. They would only cause widespread chaos and make the ninjas who had defected wary. No one wanted to become a sacrificial offering.
The bad news was that many black monsters had appeared on the battlefield. These monsters could absorb ninjas' chakra and life force. There were also Scientific Ninja Tools. When two ninjas possessed equal strength, Scientific Ninja Tools were equivalent to spare chakra reservoirs, and could unexpectedly release chakra-based ninjutsu, inflicting heavy casualties on Konoha's ninjas.
It was impossible for Konoha to catch up with Dawn Hidden Village in either of these areas. Dawn Hidden Village had begun preparing for war long before it arrived, and its technology had already matured. After Konoha ninjas killed Dawn Hidden Village ninjas, they stripped off their equipment to make up for their own shortcomings, while also sending it to the rear for emergency research.
However, Konoha was not completely unprepared. It also had powerful allies, and the arrival of those two allies made the current situation even more chaotic.
They appeared on the battlefield, and Dawn Hidden Village's ninjas sent the relevant information to Uchiha Yuu in the rear.
Sitting in his office, Uchiha Yuu wore a rare grave