Bellona

Frightful Aura. All creatures that are hostile towards Bellona, within 60 feet of her, and aware of her presence must succeed on a DC 22 Wisdom saving throw or become Frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Bellona's Frightful Aura for the next 24 hours.

Princess of Death. As a daughter of Orcus, Bellona has a special relationship with the undead. Her innate, necromantic abilities allow her to forge pacts similar to that of a warlock and their patron with any undead that are not bound to another being prior to meeting her. Forging a pact with her in this manner, grants them immunity to mind controlling effects from others aside from herself, at the cost of becoming one of her servants. Bellona can also attempt to dominate any undead that she comes across, forcing them to make a Wisdom Saving throw against her spell save DC. The more powerful the undead, the harder it is to assert dominance over them. Undead creatures: CR 5 and lower automatically fail this save, CR 10 and lower make the save at disadvantage, CR 20 and lower suffer make the save normally, and CR 30 and below make the save at Advantage.

Intimidating Presence: Bellona naturally has advantage on physically based Intimidation checks; she automatically succeeds on such checks if they are currently frightened of her.

Magic Resistance. Bellona has advantage on saving throws against spells and other magical effects.

Magic Weapons. Bellona's weapons attacks are magical.

Innate Spellcasting. Bellona's spellcasting ability is Charisma (spell save DC 22, +14 to hit with spell attacks). Bellona can cast the following spells innately, requiring no material components to do so:

At Will: Sapping Sting (11th Level)
3/day: Inflict Wounds, Spirit Shroud 
1/day: Harm

Multiattack. Bellona makes three attacks with Killmonger.

Killmonger. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: The target suffers 19 (2d10 + 7) slashing damage plus 15 (3d8) Necrotic damage. 

Shadow-Whip. Melee Weapon Attack: +14 to hit, range 20 ft., one target. Hit:. The target is pulled up to 20 feet in a straight line towards Bellona and are considered grappled.

Attack of Opportunity. Whenever a creature that Bellona can see and is within melee combat range of her attempts to leave your melee combat range, she can make .

Bellona can take 4 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. Bellona regains spent legendary actions at the start of her turn.

Killmonger. Bellona makes one attack with Killmonger.

Sapping Sting (Costs 2 Actions). Bellona casts Sapping Sting on two targets within range.

Shadow-Whip. Bellona makes one attack with Shadow-Whip.

Necrotic Crescent (Costs 3 Actions). Bellona slashes the air in front of her, causing a massive arc of necrotic energy to shoot out in front of her; she can aim this arc vertically or horizontally. The arc is 20 feet by 5 feet, oriented in the direction of her slash, and goes out to a range of 60 feet. Any creature the arc passes through must make a DC 22 Con Save or suffer 55 (10d10) Necrotic damage; they suffer half as much on a successful save.