Charged Blade Mastery

You master fighting with a charge blade, gaining the following benefits:

• Increase you strength by 1 up to the maximum of 20
• You have learned how to amplify your elemental discharge as an action you can expend any number of phial charges and release a shock wave of acid, cold, fire, or lightning damage (your choice) in a 15 foot cone in front of you.Each creature must succeed on a dexterity saving throw equal to 8 + your proficiency modifier + your strength modifier taking an amount of damage equal to your chargeable elemental  discharge damage, times the number of phials you have expended on a failed save, or half as much damage on a successful one. Once use per short or long rest.