Circe

Magic Resistance. Circe has Advantage on saving throws against spells and other magical effects.

Somnambulatory Brew. Circe can spend 1 minute preparing a tasteless liquid able to put those who drink it asleep. Any creature that drinks her concoction makes a DC 16 Constitution saving throw 1 minute afterward. On a failure, the creature falls unconscious for 1d4 hours, until it takes damage, or until someone uses an action to shake or slap the creature awake.

Transforming Wand. Circe possesses a very special wand of polymorph with 13 charges. While holding it, she can use an action to expend 1 of its charges to cast the polymorph spell (DC 16 Wisdom saving throw) from it, transforming one target humanoid into a beast. Unlike normal castings of the spell, the effect lasts for 24 hours, at which point a target can attempt a new save. After two failed saves, a polymorphed target is permanently transformed into its new form. The wand regains 2d6 expended charges daily at dawn. If the wand’s last charge is expended, roll a d20. On a 1, the wand crumbles into ashes and is destroyed.

Regeneration. Circe regains 15 hit points at the start of her turn if she has at least 1 hit point and is in direct sunlight.

Multiattack. Circe makes four Arcane Burst attacks.

Arcane Burst. Melee or Ranged Attack Roll: +10, reach 5 ft. or range 150 ft. Hit: 27 (4d10 + 5) Force damage.

Spellcasting. Circe casts one of the following spells, using Charisma as the spellcasting ability (spell save DC 20):

At Will: Detect Magic, Detect Thoughts, Disguise Self, Invisibility, Mage Armor (included in AC), Mage Hand
2/Day Each: Charm Person (level 4 version), Lightning Bolt (level 7 version)
1/Day Each: Cone of Cold (level 9 version), Mind Blank (cast before combat), Scrying, Teleport

Misty Step (3/Day). Circe casts Misty Step, using the same spellcasting ability as Spellcasting.

Protective Magic (3/Day). Circe casts Counterspell or Shield in response to the spell’s trigger, using the same spellcasting ability as Spellcasting.