Multiattack

The orobas makes four attacks: one with its bite, one with its claw, one with its flail, and one with its stomp.

Bite

Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 18 (3d6 + 8) piercing damage. The target must succeed on a DC 18 Constitution saving throw or become poisoned. While poisoned in this way, the target can't regain hit points and it takes 14 (4d6) poison damage at the start of each of its turns. The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Claw

Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage.

Flail

Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage plus 18 (4d8) acid damage.

Stomp

Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) bludgeoning damage.