Clefairy

Magic Guard. The Clefairy has advantage on saving throws against spells and other magical effects.

Innate Spellcasting. The Clefairy's innate spellcasting ability is Charisma (spell save DC 13, + 5 to hit with spell attacks). The Clefairy can innately cast the following spells, requiring no material components:

At Will:Moonbeam

Pound. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage.

Cosmic Power (1/day). The Clefairy uses cosmic magic to give itself resistance to bludgeoning, piercing, and slashing damage from nonmagical attacks for 1 minute.

Metronome (Recharge 4-6). The Clefairy waggles its fingers rhythmically, conjuring wild magic to innately cast a random spell from the Metronome Table, for which it requires no material components. Each spell on the Metronome Table has a casting time of one action, regardless of its normal casting time. The Clefairy can choose the target or targets of the spell cast by Metronome, and does so after the spell is determined.

Encore. As a reaction, the Clefairy applauds delightfully and hypnotically, attempting to enchant a creature it can see within 60 ft. of it that has just taken an action. The creature must succeed on a DC 13 Wisdom saving throw or become charmed by the Clefairy. While charmed in this way, the creature cannot take any actions on its turn other than the one given an Encore by the Clefairy for 3 (1d4 + 1) rounds. An affected creature may repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. The Clefairy can only have on creature charmed at a time.