Astral Reaper

Incorporeal Movement. The wraith 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.

Sunlight Sensitivity. While in sunlight, the wraith has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

The Reaper's Marks. The Astral Reaper chooses three targets per day from any point in any plane of existence and gives each an individual mark: The Revived, the Healer, and the Killer. The Astral Reaper can cast Power Word Kill at will, but only targeted at those who are marked as either the Revived or the Healer. The Astral Reaper is considered friendly towards the creature marked as the Killer, and this creature is immune to all attacks made by the Astral Reaper. The Astral Reaper is invisible to any creature that isn't marked by it.

Lifehunt Scythe. Melee Weapon Attack: +10 to hit, reach 10 ft., one creature. Hit: ( 1d8 + 6) 11 Slashing damage plus 8 (2d6) Cold damage plus 16 (2d6) Necrotic damage. The target must succeed on a DC 15 Constitution saving throw or its hit point maximum is reduced by an amount equal to the Necrotic damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Create Specter. The Astral Reaper targets a humanoid within 10 feet of it that has been dead for no longer than 1 minute and died violently. The target's spirit rises as a specter in the space of its corpse or in the nearest unoccupied space. The specter is under the wraith's control. The wraith can have no more than seven specters under its control at one time.