Nebulous Thoughts. Magical attempts to read the dragon's mind or glean its thoughts fail automatically.

Illumination. While it has at least 1 hit point, the dragon sheds bright light in a 20-foot radius and dim light in an additional 20 feet.

Incorporeal Movement. The dragon can move through other creatures and objects as if they were difficult terrain. It takes 6 (1d10) force damage if it ends its turn inside an object.

Unusual Nature. The dragon doesn't require air, drink, food, or sleep.

Multiattack. The dragon makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 3) piercing damage plus 5 (1d8) radiant damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 3) slashing damage.

Tail. Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 7 (1d6 + 3) bludgeoning damage.

Starlight Breath (Recharge 5-6). The dragon exhales a shower of stars in a 60-foot line that is 10-feet wide. Each creature in the cone must make a DC 17 Constitution saving throw. On a failed save, the creature takes 44 (8d10) radiant damage. On a successful save, the creature takes half as much damage.

The dragon can take the following bonus action on its turn.