Multiattack. The Achaierai makes three attacks, two with its talons, one with its beak.

Talons. Melee Weapon Attack: +7 to hit, reach 10 ft. one target. Hit: 11 (2d6 + 4) slashing damage. 

Beak. Melee Weapon Attack: +4 to hit, reach 10  ft. one target. Hit: 15 (4d6+1) piercing damage. 

Black Cloud (3/day). The Achaierai releases a cloud of poisonous black gas in a 10 foot radius sphere around itself. Creatures other then Achaierai within this sphere take 2d6 poison damage. They must also succeed on a DC 15 Constitution saving throw or become poisoned for 1d6 hours. While poisoned in this way, the creature acts as if under the effect of the confusion spell. The creature can repeat it's saving throw at the end of every hour, ending the effect upon itself on a success.