Spirit energy (玄力, Genryoku) sits in every person. The fandom wiki and the “power system explained” tapes treat it as the resource: train the nerves, raise capacity, reinforce the body, then spend a sorcery. Enchanted Blades are the overflow case. They amplify spirit until it cannot stay inside the skin and has to become a shape: goldfish, clouds, flowers, feathers. Sorcery.html on this site is the practice. This page is the fuel those videos kept asking for.
Limits the chapters actually print
Damage to the neural pathways that govern spirit energy can shut the art down. Sealed rope can stop reinforcement and spells. Some rooms, Naginojoen among them, are warded against a type of sorcery; Shiba’s teleport stops at the cemetery door. Hakuri scattered his own spirit into a private Storehouse without knowing, which is why Isou misfired until he took the energy back. Datenseki without Kunishige’s eyes returns the amplified current as a crater. See sorcery, veins in steel, True Realm.