Multiattack

The giant ant makes one Bite attack and one Sting attack.

Bite

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) bludgeoning damage, and the target is grappled (escape DC 12). Until this grapple ends, the target is restrained, and the giant ant can't Bite a different target.

Sting

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage. The target must make a DC 12 Constitution saving throw, taking 11 (2d10) poison damage on a failed save, or half as much damage on a successful one.