Homebrew Formless Species Details

your physical form has been lost or taken from you giving you a shadowy/misty appearance of your past form with your main feature being glowing eyes. you are very hard to see and hear making you proficient in stealth checks 

Formless Traits

very hard to see and hear means you are very stealthy

Darkvision

You can see in the dark (in shades of grey) up to 30 ft

Hard to see

It is hard to see you giving you advantage of stealth checks 

One with the shadows

as a bonus action you can cast invisibility when in darkness without expending a spell slot 

Unarmored Defence

Since your form isn't defined it would be harder to hit you giving you higher armour class