Blue Sharkin Fighter

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

Vicious Bite. When a Sharkin Fighter takes the Attack action on its turn, it can replace one of its attacks with a vicious bite attack. This is a natural weapon attack with which it is proficient with and uses its Strength modifier for its attack rolls. This bite does 2d6 piercing damage.

Blue Sharkin Fighters make two melee attacks: either two with its weapon or one with its weapon and one with its bite

Harpoon. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 12 (1d10 + 6) piercing damage.

Vicious Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.