Chromatic

You tap into the weave in order to temporarily change your color, and in turn, your elemental resistance.

When you get hit by an attack associated with one of the draconic colors (fire, cold, lightning, poison, acid), you can use your reaction to give yourself resistance to that damage type for the rest of your turn.

When used, your breath weapon changes into the resistance you gained. It stays this way until this feature is used to resist a different element. as a bonus action, you can change the damage type back to your original breath weapon.

You can use this feature a number of times equal to your proficiency bonus and get all uses back at the end of a long rest.