Ekzykes’ Decay

You partially transform yourself into a fearsome dragon, spewing forth a cloud of deadly scarlet rot in a 30-foot cone. Creatures caught in the cone must make a Constitution saving throw or take 2d6 poison damage on a failed save, or half as much damage on a successful one. In addition, any creature that fails its saving throw becomes poisoned for 1 minute, taking 1d6 poison damage at the start of each of its turns.