True Mimic

Prerequisite: Changeling

You have learned to mimic the ancestral traits of the creatures you impersonate. When you use your shapechanger feature, you can spend an hour transforming instead of an action, to copy one racial trait of the creature you shapechange into, other than their ability score increase, age, alignment, or size.

You must concentrate during the hour-long transformation process as if you were concentrating on a spell, or the transformation fails and you revert back to your true form. You retrain the copied racial trait until you use the shapechange feature again, revert to your true form, or die.