As with all Fey'ri, you possess ability to change your appearance at will, allowing you to blend in and conceal yourself with the rest of society. You gain the Disguise Self spell.

You can use this spell 3 times before needing to take a short or long rest. This spell does not consume a spell slot.

You can sprout demonic like wings from your back, granting you the ability of flight. Your flight speed is 60 feet. You can recall and hide your wings at will. This is done as a free action.

Being part Tanar'ri, you possess abilities similar to your kin.

You gain the access to the following spells. Produce Flame and Charm Person. 

Each spell can be used once and do not expand spell slots. You cannot use them again until you have taken a short or long rest.

Thanks to your fiendish blood, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Elves don’t need to sleep. Instead, they meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

Your Dexterity Score increases by 2 and you Intelligence Score increases by 1.

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

You have proficiency in the Perception skill 

You can speak, read, and write Common, Elven, Infernal and Abyssal.

Descended from elves and immortal beings, Fey'ri have long lifespans of around 1,200 years, living centuries longer than their elven kin when given the opportunity.