Colosso Aquático

Blood Frenzy. The colossus has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Amphibious. The colossus leth can breathe air and water.

Multiattack. The colossus makes two attacks: one with its Sting and one to constrict.

Constrict. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 17 (3d8 + 4) bludgeoning damage, and the target is grappled (escape DC 16). Until this grapple ends, the creature is restrained, and the colossus can't constrict another target.

Sting. Melee Weapon Attack: +7 to hit, reach 10 ft. , one target not grappled by the colossus. Hit: 20 (3d10 + 4) piercing damage, and the target must make a DC 14 Constitution saving throw become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itse lf on a success.