Toxic Mist (Immortal Magic)

Advanced Discipline: Dragon

A cloud of white fog billows from your hands in a 60-foot radius. Each creature of your choice in that area must make a Constitution saving throw equal to 8 + your spellcasting ability modifier + your proficiency bonus, taking 3d12 + your spellcasting ability modifier poison damage and becoming poisoned for 1 minute on a failed save, and taking half as much damage and not becoming poisoned on a success.