Null gravity field. The astral dragon can change the direction of gravity within a 30ft radius of themselves whilst within the astral sea.

Astral familiarity. The astral dragon has a 8 additional bonus onto their intelligence bonus for calculating how far they can move within the astral sea and manipulating the space around them in the astral sea. 

Detect extraplannar. The astral dragon can sense any creature that is not from the astral plane that is within 60ft of themselves. 

Sever Silver Cord. If the astral dragon scores a critical hit with its bite attack against a creature traveling through the Astral Plane by means of the astral projection spell, the dragon can cut the target's silver cord instead of dealing damage.

Multi attack. The young astral dragon makes two claw attacks and a bite attack. 

Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., 1 target. Hit: 15 (2d12 + 3) piercing damage. 

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 11 (2d8 + 3) slashing damage. 

Breath Weapons (Recharges 5/6). The astral dragon uses one of the following breath weapons.

Banishing breath. The astral dragon exhales a beam of banishing cyan energy, each creature within a 5ft wide, 50ft long line must make a DC 13 Wisdom saving throw or be banished back to their home planes.

Scouring breath. The astral dragon exhales a blast of the scouring astral storm winds, each creature in a 30ft cone must make a DC 13 Constitution saving throw or take 21 (7d6) force damage. Half as much damage on a successful saving throw.