Brett's body

Detect Life. Brett can magically sense the presence of creatures up to 5 miles away that aren’t undead or constructs. She knows the general direction they’re in but not their exact locations.

Turning Defiance. Brett and any other incorporeal undead that he controls within 30 feet of him have advantage on saving throws against effects that turn undead.

Ethereal Sight. Brett can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Unusual Nature. Brett doesn’t require air, food, drink, or sleep.

Spellcasting. Brett is a 10th-level spellcaster. His spellcasting ability is charisma (save DC 16 +8 to hit with spell attacks). Brett has the following  spells prepared:

Cantrips (at will): Message, Chill Touch, Sapping Sting, Spare the Dying, Mage Hand

1st level (4 slots): Bless, Healing Word, Protection From Evil and Good, Hex

2nd level (3 slots): Spiritual Weapon, Healing Spirit, Ray of Enfeeblement

3rd level (3 slots): Summon Undead (Ghostly Only), Revivify

4th level (3 slots): Shadow of Moil, Blight

5th level (2 slots): Reincarnate, Enervation

Strength Drain. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 9 (2d6 + 2) necrotic damage, and the target's Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or long rest

Life Drain. Melee Spell Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) necrotic damage. The target must succeed on a DC 10 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Telekinetic Thrust. Brett targets a creature or unattended object within 30 feet of it. A creature must be Medium or smaller to be affected by this magic, and an object can weigh up to 150 pounds.

If the target is a creature, Brett makes a Charisma check contested by the target’s Strength check. If Brett wins the contest, he hurls the target up to 30 feet in any direction, including upward. If the target then comes into contact with a hard surface or heavy object, the target takes 1d6 damage per 10 feet moved.

If the target is an object that isn’t being worn or carried, the poltergeist hurls it up to 30 feet in any direction. Brett can use the object as a ranged weapon, attacking one creature along the object’s path (+4 to hit) and dealing 5 (2d4) bludgeoning damage on a hit

Create Specter. Brett 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 Brett's control. He can have no more than seven specters under its control at one time.

Consume Life. Brett can target one creature it can see within 5 feet of it that has 0 hit points and is still alive. The target must succeed on a DC 10 Constitution saving throw against this magic or die. If the target dies, Brett regains 10 (3d6) hit points