Breath of Blaze and Blizzard

Prerequisite: Klaxcis race, Constitution 15 or higher, character level 6 or higher

You've learned to empower your breath in the form of a mighty burst of destructive elements. When you take the Attack action, you can replace one of those attacks with an extreme exhalation of your breath weapon, provided your mouth isn't occupied, and you can provide verbal components. When you do so, choose either a 15-foot cone or a 30-foot line originating from you or a 5-foot radius sphere centered on a point within the casting range of the cantrip you've learned from the Legacy of Frost and Blaze trait. Each creature within the area must make a Dexterity saving throw against the spellcasting ability chosen for the Legacy of Frost and Blaze trait against the effects based on the environment you chose:   Arid: The targets take PBd8 cold damage and have their speed reduced by 5 times your Proficiency Bonus in feet on a failed save, or half as much on a successful save.   Polar: The targets take PBd10 fire damage on a failed save or half as much on a success. Flammable objects within the area that aren't being worn or carried are ignited.   You can use this feat an amount of times equal to your Proficiency Bonus and regain all expended uses when you finish a long rest.