Charlotte Lillypond

Whispering Aura. At the start of each of the warlock’s turns, each creature of its choice within 10 feet of it must succeed on a DC 15 Wisdom saving throw or take 10 (3d6) psychic damage, provided the warlock isn’t incapacitated.

Multiattack. The warlock makes three eldritch blast attacks.

Eldritch Blast. Melee or Ranged Weapon Attack: +11 to hit, range 120 ft, one target. Hit: 5 (1d10 + 5) force damage 

Howling Void. The warlock opens a momentary extraplanar rift within 60 feet of it. The rift is a scream-filled, 20-foot cube. Each creature in that area must make a DC 18 Wisdom saving throw. On a failed save, a creature takes 22 (5d8) psychic damage and is frightened of the warlock until the start of the warlock’s next turn. On a successful save, a creature takes half as much damage and isn’t frightened.

Spellcasting. The warlock casts one of the following spells, using Charisma as the spellcasting ability (spell save DC 18):

At will: detect magic, guidance, levitate, mage armor (self only), mage hand, minor illusion, prestidigitation, speak with dead

3/day each: arcane gate, detect thoughts, true seeing

1/day each: Weird, true polymorph, feeblemind, 

No You Don't. As a reaction, when a creature within range casts a spell Charlotte, she may cast Counterspell, at level 3-9. She may use this reaction 6 times a day each one at a different level.