Medium Elemental, Neutral
Traits
Amphibious. The merfolk can breathe air and water.
Actions
Ocean Spear. Melee or Ranged Attack Roll: +2, reach 5 ft. or range 20/60 ft. Hit: 3 (1d6) Piercing damage plus 2 (1d4) Cold damage. If the target is a creature, its Speed decreases by 10 feet until the end of its next turn. Hit or Miss: The spear magically returns to the merfolk's hand immediately after a ranged attack.
Found on p.209 of MM2025 (Free Rules)