Hold Breath. The sea-orc can hold its breath for 3 hours.

Minor Bioluminescence. While in an area of darkness, the sea-orc can cause small lights to glow across its back and tail fins, spreading dim light in a 5 foot radius around it (no action required).

Multiattack. The sea-orc makes one Bite attack and one Tail attack.

Bite. Melee Weapon Attack: +8 to hit, reach 20 ft., one creature. Hit: 18 (4d6 + 5) piercing damage + 1 poison damage and if the target is Medium or smaller, it is grappled (escape DC 16) and is restrained until the grapple ends.

Tail. Melee Weapon Attack: +8 to hit, reach 25 ft., one creature. Hit: 14 (2d8 + 5) bludgeoning damage and the target must succeed on a DC 15 Strength saving throw or be knocked prone.

Roar (Recharge 5-6). The sea-orc lets out a monstrous roar that can be heard from up to 800 feet away. Each creature that can hear the sea-orc that is within 25 feet of it must make a DC 13 Constitution saving throw, taking 9 (2d8) thunder damage and be deafened until the end of the next round on a failure, or half as much damage and no other effects on a success.