Corvus, The Raven Queen

Amphibious. The Raven Queen can breathe air and water.

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

Improved Weapons. When making an attack roll, a roll of a 19 or 20 is considered a critical hit.

Spell Casting. The Raven Queen has access to the following spells;

Spellcasting Ability + 8 / Spell Save DC = 24 / Spell Attack Bonus + 16.

(4/Day) - Third Level; Fireball, Slow, Counterspell.

(3/Day) - Fourth Level; Polymorph, Greater Invisibility, Banishment.

(1/Day) -  Sixth Level; Bones of the Earth, Disintegrate. 

(1/Day) - Seventh Level; Forcecage.

Raven Meld. The Raven Queen can turn herself into a flock of ravens, flying and then reforming in target location within 150 feet of her.

Multi-Attack. The Raven Queen makes 2 Talon Scythe attacks.

Soul Drain. Melee Attack: +15 to hit, reach 5 feet, 1 target . Hit: (4d8 + 8) necrotic damage, and the raven queen heals for half the damage dealt.

Talon Scythe. Melee Weapon Attack: +16 to hit, reach 10 feet, 1 target. Hit: (5d8 + 10) necrotic damage.

Raven Bow. Ranged Weapon Attack: +15 to hit, range 90/360 feet, 1 target. Hit: (7d6 + 8) necrotic damage. If below 50 health after damage is dealt, the target must succeed a DC 15 Constitution saving throw or die instantly.

Relentless. The Raven Queen can take either the Dash, or the Use an Object action.

Attack of Opportunity. The Raven Queen makes 1 Talon Scythe attack.

Angelic Shield. The Raven Queen surrounds herself in a protective light shield, and causes a non-spell attack that would have hit her to miss.

The Raven Queen has 4 Legendary Actions.

Corrupt Mind. (Costs 1 Actions). The Raven Queen touches target creature within 5 feet of her, target must succeed a DC 24 Wisdom Saving Throw or be knocked prone.

Brooding Stride. (Costs 2 Actions). The Raven Queen teleports behind any target within 60 feet of her, and makes 1 Talon Scythe attack.

Flocking Arrows. (Costs 3 Actions). The Raven Queen makes 1 Raven Bow attack.

Whisper of Death. (Costs 4 Actions). The Raven Queen lets forth the voices of the dead. All creatures within a 15 foot cone of her must succeed a DC 24 Wisdom saving throw or suffer 3d8 + 8 necrotic damage and be considered frightened for 1 minute, or half as much damage and not frightened on a successful save, an affected creature can repeat the save at the end of each of their turns, ending the effect on a success.