Sousei no Onmyouji - Twin Star Exorcists Wikia
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Dragon Spots (龍黒点, Ryūkokuten) are unknown events which causes the impurites in Magano to roam in the real world. This also leads to release a source of air from Magano called Miasma which causes a impurity infection on people who don't have enough spell power, which means only Exorcists cannot be affected by the infection.

Kuranashi, one of the Basara, opened this portals to trick exorcists into lifting the miasma out of people, miasma that would enter the bodies of the exorcists themselves.

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