Toxify

Incredibly potent poison permeates a target within range. The target must make a Constitution saving throw. The target takes 1d6 poison damage immediately, plus another 1d6 poison damage at the start of each of their turns, and is poisoned, for the duration on a failed save, or half as much initial damage and then the spell ends on a successful one. This damage ignores immunity or resistance to poison damage.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, all of the damage increases by 1d6 for each slot level above 5th.