Since they were talking about improving his strength, Beichen Haotian had his own plans. According to his plan, the fastest way to grow stronger without any side effects afterward was Sage Mode.
Beichen Haotian had long heard of the three great sacred lands: Ryūchi Cave, Mount Myōboku, and Shikkotsu Forest. Mount Myōboku's Sage Mode leaned toward the physical body. Once one failed to control the balance between Natural Energy and Chakra, one would turn into a stone statue.
Ryūchi Cave's Sage Mode, on the other hand, leaned toward the mind. Once one lost control, one would become like Jugo—berserk and devoid of reason. As for Shikkotsu Forest's Sage Mode, though it had never been explicitly explained, Beichen Haotian guessed that it fell somewhere between the two, though not so distinctly.
Moreover, Beichen Haotian suspected that excessive use of Shikkotsu Forest's Sage Mode might consume one's lifespan. In the original story, Madara Uchiha and Hashirama Senju had unleashed their ultimate moves at the Valley of the End, and Hashirama had died not long after returning to the village. Aside from his severe injuries, Beichen Haotian guessed that overusing Shikkotsu Forest's Sage Mode was likely another reason.
Otherwise, it was difficult to explain how Hashirama Senju, who possessed a Sage Body and terrifyingly vigorous life force, could have died after the battle ended. Of course, this was all speculation. No one truly knew the specifics. But no matter what, he had to master a power as formidable as Sage Mode. Sage Mode was also tied to the future growth of Beichen Haotian's strength; it was the foundation that would let him fear no powerful enemy in the future.
As for where to learn Sage Mode? Beichen Haotian would not consider that for now. He had not even found one of the sacred