The Scroll of Seals in Konoha contained far too much knowledge. Two days simply were not enough.
Fortunately, Ryōken had no intention of memorizing every detail of every ninjutsu. After all, his foundation had never changed, and ninjutsu was of little use to him.
Over these two days, what Ryōken memorized most were the principles and methods of operation behind ninjutsu.
Take the First Hokage's Wood Release, which had intimidated the entire ninja world. Having read the original work, Ryōken naturally knew that the First Hokage's Wood Release was formed by combining Earth Release, Water Release, and the immense life force of the Senju Clan's Sage Body—namely, Yang Release.
But Ryōken had no idea what Wood Release truly entailed in detail.
Perhaps the secret techniques recorded in the Scroll of Seals by other clans were incomplete, making them difficult to cultivate to a profound level. But the First and Second Hokage would not have done such a thing. After all, they were people who could abandon even their clans, devoting themselves wholeheartedly to the village.
Thus, Ryōken focused on the ninjutsu of those two while reading. Besides, their techniques were the most valuable, and their understanding of ninjutsu ran the deepest.
One was the Ninja God, and the other a madman obsessed with forbidden techniques.
Wood Release techniques that blotted out the sky, the Flying Thunder God's understanding of space, Impure World Reincarnation's understanding of life and souls, ultimate Water Release—
All of these would become part of Ryōken's foundation, helping him develop more numerous and comprehensive sword techniques.
For a ninja, one could become an expert even without theory. After all, this was a world ruled by bloodlines. As long as they followed their instincts and properly developed the power they possessed, they could reach the pinnacle.
But without