As an action, you can exhale a 30-foot cone of damaging breath or cause your drake to exhale it. Choose acid, cold, fire, lightning, or poison damage (your choice doesn't have to match your drake's Draconic Essence). Each creature in the cone must make a Dexterity saving throw against your spell save DC, taking 8d6 damage on a failed save, or half as much damage on a successful one.
This damage increases to 10d6 when you reach 15th level in this class.
Once you use this feature, you can't do so again until you finish a long rest, unless you expend a spell slot of 3rd level or higher to use it again.