Cultist Avenger

Dark Devotion. The Cultist Avenger has advantage on saving throws against being charmed. 

Spellcasting. The Cultist Avenger is capable of spellcasting. It's Casting ability is Wisdom (DC 16 / +8 to spell attack rolls):
1st level (3 slots): Wrathful Smite, Shield of Faith

2nd level (2 slots): Aid, Misty Step

1/per day: Fear (3rd lvl), Hunger of Hadar (3rd lvl) 

Worshipper's Aura. The Cultist Avenger radiates a protective aura in a 10-foot Emanation that originates from it. All allies of the Cultist Avenger in this aura gain a +3 bonus to saving throws

Multiattack. The Cultist Avenger makes two greatsword attacks.

Greatsword. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 11 (2d6 + 3) slashing damage.

Superior Command. As a bonus action, the Cultist Avenger can command one of it's allies below it's CR (CR 6 or lower) to attack a creature within 30 ft. of themselves. That creature uses its reaction to make an attack against a creature of the Cultist Avenger's choosing within the allowed range. 

Opportunity attack. The Cultist Avenger makes an attack of opportunity against a creature that leaves or passes through it's melee attack reach.