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Miasma appears in Final Fantasy XIV as an Arcanist ability available at level 10. The ability deals unaspected damage to a single target with the potency of 20 and deals damage over time with a potency of 35 for a period of 24 seconds. In addition, the ability also has the chance to inflict the Disease status for a duration of 24 seconds. The ability can only be used by Arcanists, Scholars, and Summoners.
Early medical theories predating the discovery of microorganisms often associating foul air, called miasma, from crowded conditions or rotten objects as a cause of disease.