The character who achieves this feat feels a searing pain and a claw mark appears on your face. This mark has three slashes and appears in a color corresponding to the type of feat you choose (acid, cold, fire, lightning, thunder, force, or radiant) The ability of this feat is that you may cast a spell that does the described damage type at a level that is equal to your proficiency modifier. You may do this for free twice per long rest without using a spell slot. The dragon claw mark you achieve when you attain this feat reappears when you cast a spell using the feat.

You gain resistance to the damage type that you do, and the spells ignore resistance to things you do damage to. 

A character can have this feat as many times as you'd like, but you have to choose a different damage type each time.