Aiden Varyn, the Pale Harbinger

Legendary Resistance (3/Day). If Aiden fails a saving throw, he can choose to succeed instead.

Innate Necromancy. Aiden has the following innate spellcasting abilities (spellcasting ability is Charisma, save DC 16, +8 to hit with spell attacks):

At will: Thaumaturgy, Chill Touch

3/day each: Ray of Enfeeblement, Inflict Wounds (3rd-level)

1/day: Blight

Master Tactician. Aiden has advantage on all Charisma (Persuasion) and Dexterity (Stealth) checks made to influence, deceive, or manipulate others. Additionally, he can use a bonus action to grant himself advantage on the next attack roll or saving throw he makes before the end of his next turn.

Necrotic Resilience. When Aiden takes necrotic damage, he gains temporary hit points equal to half the damage taken (rounded down) instead.

Multiattack. Aiden makes two melee attacks or one melee attack and one spell attack.

Blade of Myrkul (Melee Weapon Attack). Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 4) slashing damage plus 9 (2d6) necrotic damage.

Necrotic Blast (Ranged Spell Attack). Spell Attack: +8 to hit, range 60 ft., one target. Hit: 17 (4d6) necrotic damage. The target must make a DC 16 Constitution saving throw or be stunned until the end of its next turn.

Aura of Despair (Recharge 5-6). Aiden can unleash an aura of death and despair in a 30-foot radius around him. Each creature of Aiden's choice within the area must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Soulshackle (Recharge 5-6). When a creature within 30 feet of Aiden hits him with an attack, Aiden can use his reaction to target that creature. The target must succeed on a DC 16 Constitution saving throw or take 10 (3d6) necrotic damage and have its movement speed reduced by 10 feet until the end of its next turn. A creature reduced to 0 hit points by this damage is paralyzed for 1 minute.

Aiden can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Aiden regains spent legendary actions at the start of his turn.

Tactical Movement. Aiden moves up to his speed without provoking opportunity attacks.

Frightening Presence. Aiden forces one creature within 30 feet to make a DC 16 Wisdom saving throw or become frightened for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Necrotic Infusion (Costs 2 Actions). Aiden imbues one weapon or piece of armor within 10 feet of him with necrotic energy. The next attack made with that weapon or armor within the next minute deals an additional 1d8 necrotic damage.