Thunderclap (Recharge 5–6). The air atronach causes a thunderous explosion using its action, any creature within 10 feet of the air atronach must make a Constitution saving throw, taking 2d10 thunder damage, being pushed back 10 feet and knocked prone on a failed save. Creatures that pass the saving throw take half as much damage and aren't pushed or knocked prone. Explode on Death. The air atronach causes a thunderous explosion upon its death, any creature within 10 feet of the air atronach when it dies must make a Constitution saving throw, taking 2d10 thunder damage, being pushed back 10 feet and knocked prone on a failed save. Creatures that pass the saving throw take half as much damage and aren't pushed or knocked prone.
Multiattack. The air atronach makes two attacks with it's Stone Sword. Stone Sword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 3) slashing damage. If the target is a creature, it must succeed on a DC 12 Strength saving throw or be knocked prone.