Dead Three Scion

Small or Medium Humanoid, Neutral Evil

STR
20 (+5)
DEX
14 (+2)
CON
19 (+4)
INT
18 (+4)
WIS
21 (+5)
CHA
24 (+7)
Culling Aura.

Constitution Saving Throw: DC 20, each Bloodied creature in a 30-foot Emanation originating from the scion at the end of the scion's turn. Failure: The target can't regain Hit Points until the start of the scion's next turn.

Legendary Resistance (3/Day).

If the scion fails a saving throw, it can choose to succeed instead.

Magic Resistance.

The scion has Advantage on saving throws against spells and other magical effects.

Spellcasting.

The scion casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 20):

At will: Detect Thoughts, Dispel Magic

2/day each: Dimension Door, Invisibility, Scrying

1/day each: Circle of Death, Create Undead

Command.

The scion casts Command (level 2 version), using the same spellcasting ability as Spellcasting. The scion can't take this action again until the start of its next turn.

Actions

Multiattack.

The scion makes two attacks, using Death Touch or Mindwrack Bolt in any combination.

Death Touch.

Melee Attack Roll: +12, reach 5 ft. Hit: 25 (4d8 + 7) Necrotic damage.

Mindwrack Bolt.

Ranged Attack Roll: +12, range 120 ft. Hit: 21 (6d6) Psychic damage and the target has the Poisoned condition until the start of the scion's next turn.

Legendary Actions

Legendary Action Uses: 3. Immediately after another creature’s turn, this creature can expend a use to take one of the following actions; it regains all expended uses at the start of each of its turns.

Attack.

The scion makes a Death Touch or Mindwrack Bolt attack.

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Dead Three Scion

Source: The Lost Library of Lethchauntos, p. 256 - Licenses and attribution