"Taishôgeki" is the name of a philosophy and corresponding book, written by a powerful historical figure of Aqualon. He had spent time in the realm of the Aesir and bested them in combat, traveling through the Great Land afterwards to seek wisdom in many places, speaking to many philosophers and mages of his time. Before writing the book, he fought one of the Valkyries on top of the tallest peak of the Yamato Mountain Range and bested her, and as the legend goes, he ripped her soul out of her shattered body, and forged it into a great, metal gate that connected the physical world and the Great Clockwork on top of that mountain, where he had a monastery built to uphold his teachings.