"Eye Power detected. Imprint?"
Uchiha Chen had been about to imprint Kamui, the overpowered eye technique, without a second thought. But the screen of his Prosthetic Eye began to flicker, and another small window popped up:
"Foreign Eye Power detected. Imprint?"
Two windows?
Foreign Eye Power should mean Kamui, after all. He still had the remnants of Obito's eye in his hand. Did the other one mean his own Eye Power had reached Mangekyō level?
Uchiha Chen came back to his senses, somewhat dazed.
When a Uchiha experienced intense emotional stimulation, his brain would produce a special kind of Chakra, which in turn prompted the Sharingan to evolve.
That was Senju Tobirama's theory, after a lifetime spent studying how to deal with the Uchiha. It also aligned with the mainstream Uchiha view.
But Senju Tobirama wasn't a Uchiha, and the overall level of scientific research during the late Warring States period and the early days of the village system, along with the limits of what people knew about the human body and cells, had restricted his research.
Chakra was the product of fusing spiritual and physical energy in equal proportions. That was common knowledge even among Ninja Academy students.
And the Uchiha's Eye Power was also a special kind of Chakra—
It was Chakra extracted from certain cells in a Uchiha's brain.
Matter was fundamental.
Based on Uchiha Chen's research, the process by which the Sharingan evolved was actually:
Under intense emotional stimulation, certain brain cells underwent specialization and mutation—or, to put it less delicately, became diseased.
→ The specialized cells could produce higher-quality Eye Power → When this high-quality Eye Power entered the eyes, it triggered the Sharingan's evolution.
And today, Uchiha Chen had made a discovery worthy of going down in Uchiha history:
The extreme emotions that spurred