Shoki

Shoki (miasma-energy), also translated as just “miasma”. Rather than being the "magical" energy created by youkai, shoki is the fumes/gas that can be created by youkai, as well as potions, powders, and the like. Miasma exists as a plague-like mist that consumes all in the immediate area and is quite potent in its use. Naraku is the most outstanding character at the use of shoki, if one part of his body is cut it releases shoki in the form of gas.