Shiryōjutsu

Shiryōjutsu (死霊術, "Necromancy) is a type of Fujutsu that allows the user to reanimate and control deceased humans or animals. Corpses will remain reanimated until their source of Furyoku is completely depleted. Shamans who specialize in Shiryōjutsu are known as Shiryōjutsushi (死霊術師, "Necromancers").

Origins
Shiryōjutsu was originally created by Fusho aligned Shamans who desired to revive their fallen comrades following the First Great Spirit War. However, Onmyodo had no means of doing so and as a result, Shamans took inspiration from Onmyo Magic to develop the polar opposite, Necromancy.

By imbuing Corpses with Furyoku rather than paper dolls, Shamans could reanimate the fallen to serve them indefinitely. This was seen as superior to utilizing paper dolls but was frowned upon in the Fusho community, deemed Dark Magic.

Overiew
Necromancy is widely viewed as Dark Magic due to its death-force manipulating nature. By tapping into the Furyoku residuals left behind by a living individual when after they die, Shamans can reanimate corpses and bend them to their will. There are also various spells within the Necromancy spectrum that produces different effects using the remains of the dead as a medium.

Skeletons, Jiangshi, and other types of undead utilize their Necromancer's Furyoku in a similar fashion to Fukoken, albeit against their will. This allows the undead to manifest supernatural abilities and makes them completely resistant to physical blows. Undead are known to be weak towards fire-based Onmyo Magic.

Advanced Necromancers can summon temporarily revive the soul of the body that's being reanimated. This costs much more Furyoku than normally required to perform Necromancy, but it is often worth it. For example, Taoist Shamans specialize in this type of Necromancy, which allows them to summon a select few Jiangshi with exceptional abilities and high intelligence as opposed to an army of mindless skeletons.