Multiattack. The scorpion makes three attacks: two with its claws and one with its sting.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: (1d8 + 4) bludgeoning damage, and the target is grappled (escape DC 16). The scorpion has two claws, each of which can grapple only one target.
Sting. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: (1d10 + 4) piercing damage, and the target must make a DC 16 Constitution saving throw, taking (4d10) poison damage on a failed save, or half as much damage on a successful one.