Audrey II

Sporous Attraction. When Audrey II is fed with the blood of a humanoid, it uses a large pulse of psychic energy to bring about its feeder's deepest desires, and gives the feeder advantage on all charisma checks while within 5 miles of itself for the next week.

Probing Telepath. If a creature communicates telepathically with Audrey II, Audrey II learns the creature's greatest desires if Audrey II can see the creature.

Telepathic Bond. The Audrey II (Fed) ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.

Innate Spellcasting. Audrey II's spellcasting ability is Charisma (spell save DC 16, +4 to hit with spell attacks). Audrey II can innately cast the following spells, requiring no material components:

6/day each: Shield

4/day each: Chaos Bolt, Command

3/day each: Dominate Person

2/day each: Absorb Elements, Create or Destroy Water, Erupting Earth, Evard's Black Tentacles

1/day each: Antipathy/Sympathy, Prismatic Spray, Wall of Thorns

Multiattack. The Audrey II (Fed) makes 2 vine attacks and if it can, either bites or swallows

Vine. Melee Weapon Attack: +6 to hit, reach 20 ft., one target. Hit: 18 (4d6 + 4) bludgeoning damage. The target is grappled (escape DC 16) if it is a large or smaller creature. Until this grapple ends, the target is either restrained or pulled within 10 feet of Audrey II and it can make a bite attack as a bonus action. 

Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., 1 target. Hit: 22 (4d8 + 4) piercing damage. The target is grappled (escape DC 15) if it is a large or smaller creature and it is restrained. Audrey II can't bite another target while this is active.

Swallow. Audrey II makes a bite attack against a large or smaller creature it is grappling. If the attack hits, the creature is swallowed and the grapple ends. The swallowed creature is blinded and restrained and it takes 3d6 acid damage at the start of each of Audrey II's turns. If Audrey II takes 35 damage on a single turn from creatures inside it, Audrey II must make a DC 20 Constitution saving throw or regurgitate all swallowed creatures, each of which fall prone 10 ft. away from Audrey II.

Audrey II can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. Audrey II regains spent legendary actions at the start of its turn.

Counterspell (Costs 1 Action). Audrey II casts Counterspell at 4th level.

Shape the Dream (Costs 2 Actions). When Audrey II is attacked, it can draw upon its psychic powers to make the attack only happen in the attacker's mind. To everyone else, they did nothing with their action.

Long Fall into Darkness (Costs 3 Actions).Audrey II uses its psychic power to open a gaping maw underneath one creature. The pit is not real, but it is to them. The creature must make a [Wisdom] saving throw. On a fail, they take 4d8 + 4 psychic damage and the target is stunned until the end of its next turn and knocked prone. If they succeed, they take half damage and are dazed until the end of its next turn.