You're either medium or small. As an action, you may change your size; but your armor, unless custom made for Ethereals, does not change.

Upon reaching 3rd level, you may cast Blur on yourself with this trait, without the material component. Starting at 5th level, you may cast Blink upon yourself using this trait, without the material component. Once you cast either of these spells with this trait, you can’t cast that spell with it again until you finish a long rest. You can also cast these spells using spell slots you have of the appropriate level.

Intelligence, Wisdom, or Charisma is your spellcasting ability for these spells when you cast them with this trait (choose when you select this race).

The circumstances of your creation were tragic, but perhaps silver linings are found in all things.

• You have advantage on saving throws against being poisoned, and you have resistance to poison damage.
• You don’t need to eat, drink, or breathe.
• You are immune to disease.
• You don't need to sleep, and magic can't put you to sleep.

Your physical form is shackled by Arcane Bindings, enchanted bandages or chains that hold the magical energy of your being in check. While you are bound, you are subject to the following. 

• You gain a +1 bonus to Armor Class.
• You can don only armor with which you have proficiency. To don armor, you must incorporate it into your body over the course of 1 hour, during which you must remain in contact with the armor. To doff armor, you must spend 1 hour removing it. You can rest while donning or doffing armor in this way.
• While you live, your armor can't be removed from your body against your will.

The Ethereal may instead unshackle themselves, instead be subject to the following effects. 

• You may not attack, nor move more than 30 feet from the location of your shed bindings. 
• You become incorporeal, and cannot be influenced by corporeal things, nor influence them, including physical barriers such as walls
• Your bindings remain where you left them, and turn invisible. Rebinding yourself takes a full round of work, and grants a level of exhaustion. 

You gain proficiency with Deception, and one professional tool of your choice.

Ethereals may choose a standard +2, +1 to any two seperate ability scores.

The Ethereals speak most languages known, but all know Common with certainty, as well as what is known as Primordial in the Forgotten Realms.