Armor Class 13
Hit Points 45 (6d10 + 12)
Speed 10 ft., swim 40 ft.
Senses Darkvision 60 ft., passive Perception 10
Languages Abyssal, Primordial (Aquan)
Challenge 2
Amphibious. The merrow can breathe air and water.
Multiattack. The merrow makes two attacks, using Bite, Claw, or Harpoon in any combination.
Bite. m +6, reach 5 ft. Hit: 6 (1d4 + 4) Piercing damage, and the target has the Poisoned condition until the end of the merrow's next turn.
Claw. m +6, reach 5 ft. Hit: 9 (2d4 + 4) Slashing damage.
Harpoon. m,r +6, reach 5 ft. or range 20/60 ft. Hit: 11 (2d6 + 4) Piercing damage. If the target is a Large or smaller creature, the merrow pulls the target up to 15 feet straight toward itself.
Monster Manual (2024), p. 210