Vrock's Spores

You release a burst of toxic spores in a cloud around you. The spores spread around corners. Each creature within 15 feet of you, other than you, must succeed on a Consitution saving throw or become poisoned for 1 minute. While poisoned this way, a target takes 1d10 poison damage at the start of each of its turns. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Emptying a vial of holy water on the target also ends the effect on it.