Metallic Dragonborn

Races that are not Large nor have an innate flying speed gain an extra Feat of their choice. This Feat must be a "Full Feat".

Your character can speak, read, and write Common and one other language of your choice. 

You gain 3 ability points to increase any abilities of your choice. You can't increase a single ability by more than 2 with these points.

You have a metallic dragon ancestor, granting you a special magical affinity. Choose one kind of dragon below. This determines the damage type for your other traits.

Brass - Fire

Bronze - Lightning

Copper - Acid

Gold - Fire

Silver - Cold

As an action, you can exhale a breath attack in a 15-foot cone. Each creature in that area must make a Dexterity saving throw (DC is equal to either your Mastery Save DC or Spell Save DC). On a failed save, the creature takes 1d10 damage of the type associated with your Metallic Ancestry. On a successful save, it takes half as much damage. This damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).

You can use your Breath Weapon a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

You have resistance to the damage type associated with your Metallic Ancestry. 

At 5th level, you gain a second breath weapon. As an action, you can exhale a breath attack in a 15-foot cone. The save DC for this breath is equal to either your Mastery Save DC or Spell Save DC. Whenever you use this trait, choose one of the following options:

Enervating Breath. Each creature in the cone must succeed on a Constitution saving throw or become incapacitated until the start of your next turn.

Repulsion Breath. Each creature in the cone must succeed on a Strength saving throw or be pushed 20 feet away from you and be knocked prone.

Once you use your Metallic Breath Weapon, you can’t do so again until you finish a long rest.