You may pick one type of true dragon you gain resistance to damage of that type and your fire breath deals damage of that type 

You can transform into a dragon a number of times equal to a third of your level (minimum of 1) as a dragon your AC are 15+ your dex modifier. Your size becomes large. You gain a flying speed of 60 feet. and you can use a breath weapon once per time you shapeshift into a dragon the breath weapon makes the target make a dex save the DC equaling your dexterity+10+ your proficiency bonus on a fale the target takes 3D6 damage taking half as much on a success. This damage is the type of your draconic ancestors. you turn back into a human at the end of 1 minute.