Incorporeal Movement: The specter can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Astral Invisibility: The specter is invisible while in dim light or darkness.

Starlit Touch: The specter's attacks are considered magical and silvered for overcoming resistances and immunities.

Multiattack: The specter makes two Starlit Touch attacks.

Starlit Touch: Melee Spell Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (3d6 + 4) necrotic damage. The target must succeed on a DC 16 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest.

Astral Scream (Recharge 5-6): The specter releases a haunting, cosmic scream. Every creature within 30 feet of the specter that can hear it must make a DC 16 Wisdom saving throw, taking 22 (4d10) psychic damage on a failed save, or half as much damage on a successful one.

Ethereal Avoidance: When the specter is hit by an attack, it can use its reaction to become ethereal until the start of its next turn. While ethereal, it is immune to all damage except force damage, and it can pass through creatures and objects as if they were difficult terrain, but it can't end its turn inside them.