Apriak, the Oathbreaker

Legendary Resistance (3/Day). If Apriak, the Oathbreaker fails a saving throw, it can choose to succeed instead.

Necrotic Smite (Recharge 5-6). When Apriak, the Oathbreaker hits an attack with a melee weapon, he smites, dealing an additional 23 (5d8) necrotic damage.

Multiattack. Apriak, the Oathbreaker attempts to grapple the nearest creature. Apriak then makes three Longsword attacks.

Longsword. Melee Weapon Attack: +16 to hit, reach 5 ft., one target. Hit: 17(1d8+13) slashing damage and 5 (1d8) necrotic damage.

Soul Crush (Recharge 6). The creature currently grappled by Apriak, the Oathbreaker must make a DC 18 Charisma saving throw. On a failed save, they take necrotic damage equal to half their current hit points, rounded up.

Dread Lord Shadow Attack. When Apriak, the Oathbreaker's aura of gloom from the Dread Lord feature is active, he can perform a +9 melee spell attack that deals 20 (3d10+3) necrotic damage.

Apriak, the Oathbreaker 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. Apriak, the Oathbreaker regains spent legendary actions at the start of its turn.

Detect. Apriak, the Oathbreaker makes a Wisdom (Perception) check.

Longsword. Apriak, the Oathbreaker makes a longsword attack.

Cleansing Touch (Costs 2 Actions). Apriak, the Oathbreaker ends one spell on itself

Necrotic Preparation (Costs 3 Actions). Apriak, the Oathbreaker recharges it's Soul Crush ability.