As a Changeling, you have the following racial traits.
Ability Score Adjustment: Your starting Constitution score increases by 1.
Speed: 30 feet.
Organ Bypass: Once per day, when a critical hit is scored against you, you may choose for that attack to be resolved as a normal hit.
Minor Change Shape: As an action, you make yourself—but not your clothing, armor, weapons, and equipment—look different. You can become 1 foot shorter or taller and can appear thin, fat, or in between. You must adopt a form that has the same basic arrangement of limbs. The spell lasts for 1 hour, unless you use your action to dismiss it sooner. The effect lasts until you choose to take an action to change shape again. If a changeling dies, they revert to their natural shape. Anyone who observes you and succeeds on a DC 20 Wisdom check becomes aware that you are disguised. A creature under the effect of a True Seeing spell can detect that you are a changeling.
Natural Linguist: At 7th, 12th, and 17th level, instead of increasing your skill die or learning a new skill, you may instead learn to speak, read, and write two additional languages.
Languages: You can speak, read, and write Common, as well as a number of additional languages of your choice equal to your Intelligence modifier, provided it is positive.
Subrace: Choose a subrace. The two subraces of changelings presented here, passer and seeker, represent how a changelings’ personal views of their shape changing abilities affect how they practice and use those abilities.
Passers are changelings who wish to fit in with conventional society and live life in only one form or at the least suppress their shape changing abilities to better fit in with those around them.
Ability Score Adjustment: Your starting Charisma score increases by 1.
One Life, Many Faces: After using your Minor Change Shape and resting for 8 hours in that form, only another changeling that succeeds a DC 20 Wisdom check or a creature under the effect of a True Seeing spell can detect that you are a changeling. This ability lasts indefinitely or until you use Minor Change Shape again.
Seekers are proud of their shape changing ability and use it to their advantage whenever possible. They prefer their natural form over any disguise.
Ability Score Adjustment: Your starting Dexterity score increases by 1.Double Jointed: You have advantage on ability checks to resist or escape being tied up, shackled, grabbed, or otherwise physically restrained. You also have resistance to damage from falls or from being crushed by falling objects.