chromatic chaos

You cause chaotic energy to swirl around you in a 10 foot radius. Each creature that starts its turn in the radius or enters it for the first time on a turn must make a dexterity saving throw or take 5d6 fire, lighting, cold, acid, or poison damage, your choice, or half as much on a success. As an action, you can launch a bolt of energy from the chaos, the bolt has the property of third level chaos bolt. When you launch the bolt, it decreases the spells damage by 1d6 for the duration of the spell, if the dice becomes zero, the spell ends.