BENEFITS
Blood Frenzy (Trait). The hybrid has advantage on melee attack rolls against any creature that doesn’t have all its hit points.
Increased Fortitude. The hybrid has five additional Hit Dice, and its hit point maximum is increased by 32 plus its Constitution modifier, multiplied by 5. Might of the Sea. The hybrid has a +4 bonus Strength and Constitution.
Shark Biology. The hybrid has a swim speed equal to its speed, and has the Bite action.
Water Breathing (Trait). The hybrid can breathe underwater.
ACTIONS
Bite. Melee Weapon Attack: +(Strength modifier + proficiency bonus) to hit, reach 5 ft., one target. Hit: (4d10 + Strength modifier) piercing damage, and the hybrid regains hit points equal to half the damage dealt (rounded down).
Ref:TPKB1 p18