Merrow

Merrow haunt coastal waters, preying on fisherfolk, merfolk, and any other edible creature that crosses their path. These savage monsters snatch and devour unwary prey, hauling drowned corpses back to their underwater grottoes to feed.
Transformed Merfolk Long ago, a tribe of merfolk found an idol of Demogorgon at the bottom of the sea. Not knowing what it was, they brought the artifact to their king. Everyone who touched the idol became afflicted with madness, including the king, who decreed that a sacrificial ritual be performed to open a gateway to the Abyss. The ocean turned red with the blood of slaughtered merfolk, but the ritual worked, and the king led the survivors through the underwater gate to Demogorgon's layer of the Abyss. The merfolk remained there for generations, fighting for their lives as the Abyss warped them completely, transforming them into hulking, evil monstrosities. Thus, the first merrow were born.
Coastal Bullies Whenever an opportunity presents itself, the Prince of Demons sends merrow back to the Material Plane to wreak havoc in the oceans. The merrow are bullies, attacking all creatures smaller and weaker than themselves. Merrow dwell in undersea caves filled with treasures and trophies, taken from their victims and sunken ships. They tie the rotting corpses of dead enemies and drowned sailors to strands of kelp to mark the borders of their territory.

Merrow

Merrow haunt coastal waters, preying on fisherfolk, merfolk, and any other edible creature that crosses their path. These savage monsters snatch and devour unwary prey, hauling drowned corpses back to their underwater grottoes to feed.

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Armor Class	13 (natural armor)
Hit Points	6d10+12
Speed	10ft.	Swim 40ft.
Strength	18 (+4)
Dexterity	10 (+0)
Constitution	15 (+2)
Intelligence	8 (-1)
Wisdom	10 (+0)
Charisma	9 (-1)
Senses	Darkvision 60ft.	Passive Perception 12
Languages	Abyssal	Aquan
Challenge	2 (450 XP)
Special	Amphibious	The merrow can breathe air and water
Action 1	Multiattack	The merrow makes two attacks:	one with its bite and one with its claws or harpoon
Action 2	Bite	Melee Weapon Attack	d20+6 to hit
Reach 5 ft., one target	Hit 1d8+4 piercing damage
Action 3	Claws	Melee Weapon Attack	d20+6 to hit
Reach 5 ft., one target	Hit 2d4+4 slashing damage
Action 4	Harpoon	Melee or Ranged Weapon Attack	d20+6 to hit
Reach 5 ft. or range 20/60 ft., one target	Hit 2d6+4 piercing damage.	If the target is a Huge or smaller creature,	it must succeed on a Strength contest against the merrow
or be pulled up to 20 feet toward the merrow