Astral Born:
Creatures born in the void are called Astral Born. abominations to all material and ethereal plains their existence alone is considered unactual. there are many ways an Astral born may come into existence and a variety of grotesque ways they may look. but common traits shared is powerful psionics, telepathy, and a nature to cause problems for mortals.

Physical Appearance

• Ability Score:
  Increase Intelligence score by 2 and Constitution Score by 1

• Lifespan:
  It’s unknown how long Astral born live or even if they age. Most born where time does not flow it’s safe to assume most simply ignore the ravages of time.

• Alignment:
  

• Size:
  

• Speed:
  You have a levitate and flying speed of 60ft

• Languages:
  You can also communicate telepathically with a number of creatures up to your Intelligence score.

• Creature Sense:
  

• Magic Resistance:
  

• Mind Blast:
  The mind flayer magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 19 Intelligence saving throw or take 22 (4d8 + 4) psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

• Devour
  Melee Weapon Attack: +7 to hit, reach 5 ft., one incapacitated humanoid grappled by you. Hit: The target takes 55 (10d10) piercing damage. If this damage reduces the target to 0 hit points, You kill the target by devouring it whole.

• Mind Lock
  You can cut your mind off from all hostile forces. Your intelligence is treated as 1 by all external creatures, spells or other forces that detect the intelligence of a creature. You gain the following benefits.
  • you cannot be located by magical means, Scrying, locate person. Message spells or other telepathic abilities have no effect on you.

If your Dm allows the background trait to be replaced by a feat as per the Strixhaven Content book or One D&D Unearthed Arcana fill this out