Tiamats Blessed Curse

You have been blessed, some say cursed. by tiamat and have been granted the ability to be somewhat like her. Your body changes as your scales match that of the chromatic queen. You might have a red scaled arm, a black scaled tail, and a blue scaled face. You are an abomination to others but they keep their distances. 

-When you complete a long rest, you may change your draconic ancestry you chose upon character creation, by switching the damage type your breath weapon is and the damage you are resistant to both accordingly. You may only change from one chromatic colour to another.

-upon taking lightning, acid, poison, cold or fire damage, you may use your reaction to temporarily swirl the colours of your scales and gain resistance against the triggering damage, you may use this feature a number of times equal to your proficiency bonus, and regain all uses upon completing a long rest.

**Curse:** if you are metallic upon taking this feat, you become the chromatic variation of your colour immediately and can no longer revert back to your metallic skin. Also you become somewhat deformed, taking on all the chromatic colors on your scales. Nothing short of a wish spell can remove this curse. Should the curse be removed you lose this feat and must choose another one from the list of available feats.