Multiattack. The witch makes two Poison Dagger attacks. It can replace one of these attacks with Spellcasting.

Poison Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage plus 21 (6d6) poison damage.

Polymorph Concoction (1/Day). The witch hurls a bottle of liquid at a point up to 20 feet away from itself, which shatters into a cloud of magical smoke that fills a 10-foot-radius sphere. Each creature in that area must succeed on a DC 16 Wisdom saving throw or transform into a creature, as if under the effects of a polymorph spell, transforming into one of the following forms (roll a d4): 1, bat; 2, frog; 3, lizard; or 4, rat. This transformation lasts for 1 hour or until the creature drops to 0 hit points in its new form.

Shattered Shards. The witch targets a point it can see within 30 feet of itself. The air there magically solidifies into a mirrorlike pane, then shatters in a 15-foot cone originating from that point. Each creature in that area must make a DC 16 Dexterity saving throw, taking 25 (10d4) force damage on a failed save, or half as much damage on a successful one.