Before Enchanted Blades exist, Subaru Urita’s work Japanese Katana and the Flow of Spiritual Energy argues that material is the key. Tiny disturbances from carbon, construction, and heat create pathways he calls veins. Spirit energy follows them the way current follows a wire. A blade designed around veins cuts clean. Hasumi’s lab had been looking for a storage battery for Datenseki overflow. Subaru’s veins are a conductor, not a battery. Kunishige’s eyes are what let the conductor survive 1,000 degrees of ore that wants to explode.
Why YouTube kept pausing chapter 125
Anime Explained and the spoiler tapes treat this blackboard as the power-system reveal. Smelting.html is the kiln. This page is the thesis on the board: veins, magnetite, tatara observation, Noro as expelled impurity. The first Enchanted Blade is still unnamed when tamahagane comes out of the collapsed furnace. See smelting, Subaru, first blade talk.