Djinn's Tonic

When you drink this potion, you gain the effect
of the gaseous form spell for 10 minutes (no
concentration required) or until you end it early
using an action. When the effect ends, your form rematerializes in a rush of air, forcing all Large
and smaller creatures within 30 feet of you to
make a DC 15 Strength saving throw. On a failed
save, a creature is pushed 10 feet away from you
and knocked prone.