Originally Posted by
Gnomes2169
You would get the damage immunities of the dragon as a resistance and the breath weapon as normal. As an example, an amethyst dragonborn would get resistance to force damage and have a 60 foot line breath weapon that deals force damage. The amethyst dragonborn would not gain resistance to poison or fire damage, and does not gain immunity to the poisoned condition. It's probably a good thing to address, so thank you for bringing it up!