This was indeed impossible.
Under normal cultivation, Uchiha Shin truly would have needed three months to half a year to achieve it.
However, Uchiha Shin had previously obtained Zhurong's Fire Source Pill. He had gradually fused the Fire Source Pill into his body, and fire already existed within him.
It had already affected his body, which was why he cultivated the Firefly Technique so quickly.
Yet Uchiha Shin himself did not understand this reason, nor did Taiyi Zhenren know.
"You've cultivated very well, but this is only the beginning. You need to continue cultivating and strengthen your Firefly Technique," Taiyi Zhenren said.
"Yes, Senior Brother. Is there any way to speed up the strengthening process?" Uchiha Shin asked.
Taiyi Zhenren thought for a moment. "It would be better if you could cultivate beside powerful flames."
Uchiha Shin understood.
He began cultivating his Firefly Technique in front of Golden Light Cave, while lighting a great fire beside himself.
Nezha had finally finished copying the entire formation manual. He was exhausted, and his eyes ached terribly.
After leaving Golden Light Cave and seeing Uchiha Shin cultivating the Firefly Technique, Nezha was greatly surprised.
"Big Brother Shin, have you cultivated that quickly? Or have I been copying for a very long time?" Nezha walked over and asked.
Uchiha Shin smiled faintly. "I only just started cultivating too."
Nezha admired Uchiha Shin. He also knew how formidable and difficult the Firefly Technique was.
He had not cultivated the Firefly Technique, because Taiyi Zhenren had said that Nezha was not suited for it.
Nezha was in no hurry to return to the Heavenly Court, so he remained at Golden Light Cave to cultivate with Uchiha Shin. The two of them lived quite happily.
"Big Brother Shin, if you want to strengthen the power of the