Ara Siannodel, The Black Seraph

Aura of Hate. Ara and allied fiends and undead within 30 feet gain a +5 damage bonus to melee weapons.

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

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

Innate Spellcasting. Ara's spellcasting ability is Charisma (spell save DC 18, +10 to hit with spell attacks). It has the following paladin spells prepared:

At Will: command, hellish rebuke (3rd level), 

3/Day: counterspell, hold person (4th level), destructive wave (necrotic)

Multiattack. Ara makes two attacks with Nine Lives Stealer and one attack with Draconic Claw. One attack may be replaced with Stygian Rend or Revelation Beam, if able.

Nine Lives Stealer. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 21 (2d8 + 12) slashing damage plus 18 (4d8) necrotic damage.

Draconic Claw . Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 23 (5d8) force damage. The target becomes grappled (escape DC 20). Until this grapple ends, Ara cannot use Draconic Claw against another creature.

Stygian Rend (Recharge 5-6). Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 49 (14d6) necrotic damage and the target must succeed a DC 20 Constitution saving throw or become poisoned for 1 minute. While poisoned in this way, the target is under the effects of the slow spell.

Revelation Beam (Recharge 5-6). Ara summons the soul of a dragon to release torrent of abyssal flames in a 60 ft. line 10 ft. wide. Each creature in the line must make a DC 20 Dexterity saving throw, taking 45 (10d8) fire damage plus 45 (10d8) necrotic damage on a fail, and half as much on a success. Creatures hit with the beam cannot heal until the start of Ara's next turn.

Grasp of Oblivion (Recharge 6). NOTE: Activated by Legendary Action. Ara fragments the soul of the creature in her grasp. The target takes 55 (10d10) psychic damage and must make a DC 20 saving throw for each ability.

• Strength: Your speed becomes 0.
• Dexterity: You cannot take reactions.
• Constitution: You cannot concentrate on spells.
• Intelligence: You cannot cast spells greater than 3rd level.
• Wisdom: You cannot use class features.
• Charisma: You cannot activate magic items.

A creature can reroll saves at the beginning of subsequent turns.

Condemnation. Ara can make Draconic Claw attack if a creature misses a melee attack, or she can fly up to half her speed if a ranged attack missed.

The champion 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. The champion regains spent legendary actions at the start of her turn.

Fell Strike. Ara makes one Nine Lives Stealer or Draconic Claw attack.

Cast a Spell (Costs 2 Actions). Ara uses Spellcasting.

Throttle (Costs 2). Ara moves up to half her speed while dragging a creature grappled by Draconic Claw. This movement doesn't provoke opportunity attacks. At the end of this movement, Ara then chooses one of the following:

• Crushing Descent. Slam the creature into the ground or a solid surface. The target takes 4d8 bludgeoning damage + 4d8 necrotic damage, is knocked prone, and the grapple ends.
• Aerial Castigation. Hurl the creature into an unoccupied space within 20 feet. The creature lands prone and takes 3d6 bludgeoning damage for every 10 feet it was thrown (maximum 6d6). If the creature collides with another creature, both must succeed on a DC 20 Dexterity saving throw or fall prone.

Gather Oblivion (Cost 3). Ara tightens her grip around a creature she is grappling. Ara uses Grasp of Oblivion on her turn.