Rajada de vento

2nd level evocation

A line of strong wind 60 feet long and 10 feet wide blasts from you in a direction you choose for the spell's Duration. Each creature that starts its turn in the line must succeed on a Strength saving throw or be pushed 15 feet away from you in a direction following the line.

Any creature in the line must spend 2 feet of Movement for every 1 foot it moves when moving closer to you.

The gust disperses gas or vapor, and it extinguishes candles, torches, and similar unprotected flames in the area. It causes protected flames, such as those of lanterns, to dance wildly and has a 50 percent chance to extinguish them.

As a Bonus Action on each of your turns before the spell ends, you can change the direction in which the line blasts from you.

Enquanto eu não vejo uma maneira de lançar isso em um místico sem multi-classing, há um item que pode fazê-lo.

Ventoinha

adventuring gear (wondrous item)

Item Rarity: Uncommon

While holding this fan, you can use an action to cast the Gust of Wind spell (save DC 13) from it. Once used, the fan shouldn't be used again until the next dawn. Each time it is used again before then, it has a cumulative 20 percent chance of not working and tearing into useless, nonmagical tatters.

O feitiço não faz distinção entre gás ou vapor mágico e não-mágico, mas provavelmente ainda dependerá da decisão do Mestre. O feitiço Nuvem de nevoeiro diz especificamente

You create a 20-foot-radius Sphere of fog centered on a point within range. The Sphere spreads around corners, and its area is heavily obscured. It lasts for the Duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.