Shōki (InuYasha)
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In the manga and anime series, InuYasha, shōki (瘴気), which is known as miasma in the English version, is a poisonous gas employed by Naraku. It is not so much an attack as it is a boundary. The shōki is a standing field of purplish gas, toxic in nature, which surrounds any place he wishes to secure. The gas itself has 'slow kill' properties, gradually poisoning anyone entering it within a matter of minutes.
It can also take the more deadly form of a liquid, which melts almost anything it comes in contact with. This, however, does not occur until later in the series, implying that it takes more effort and / or magical power for Naraku to generate shōki in a liquid state.
In an anime episode, Naraku gives a fake Shikon shard made of this substance to Koga. It is inherently unstable and poisoned Koga instead.
Naraku's shōki has a single theme song, entitled simply "Shōki". It is featured on "InuYasha Ongaku Hen Ni".