Multiattack

The spawn makes one Bite attack and two Sting attacks. It can replace its Bite attack with a use of Swarming Cough, if available.

Bite

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage.

Sting

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 2) piercing damage plus 3 (1d6) poison damage, and the target must succeed on a DC 15 Constitution saving throw or become poisoned until the end of its next turn.

Swarming Cough (3/Day)

The spawn belches forth a swarm of insects. The swarm is an ally of the spawn, obeys its spoken commands, and takes its turn immediately after the spawn's. The swarm remains for 1 minute, until the spawn dies, or until the spawn dismisses it as a bonus action. The spawn can have no more than two swarms under its control at a time.