Blodeuwedd

Allergen Aura. The blodeuwedd exudes an aura of pollen and irritating allergens that forces living creatures who start their turn within 30 feet to make a DC 14 Constitution saving throw. On a failed save, the target is poisoned , coughing and sneezing for 1d6 rounds. A blodeuwedd can suppress or initiate this aura as a bonus action.

Shapechanger. The blodeuwedd can use its action to polymorph into a single, unique Medium humanoid or an owl. Other than its size, the blodeuwedd’s statistics are the same in each form. Any equipment it is wearing or carrying isn’t transformed. A blodeuwedd reverts to its true form upon death.

Innate Spellcasting. The blodeuwedd’s innate spellcasting ability is Wisdom (spell save DC 13). The monster can innately cast the following spells, requiring no material components:

At will: dancing lights, entangle, message, plant growth

3/day each: modify memory, sleep, spike growth 

1/day each: geas, goodberry, hallucinatory terrain

Multiattack. The blodeuwedd makes two attacks with its claws or sling.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d6 +6) slashing damage.

Sling. Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 7 (1d4+5) piercing damage.