Armor Class 14
Hit Points 97 (15d8 + 30)
Speed 10 ft., swim 40 ft.
Saving Throws DEX +7, CON +5, WIS +7, CHA +5
Skills Perception +7
Damage Resistances cold
Senses passive Perception 17
Languages Common, Primordial (Aquan)
Challenge 6
Amphibious. The merfolk can breathe air and water.
Multiattack. The merfolk makes two Aquatic Burst attacks.
Aquatic Burst. m,r +7, reach 5 ft. or range 60 ft. Hit: 20 (3d10 + 4) Cold damage. If the target is a Large or smaller creature, it has the Prone condition.
Watery Rebuke. An enemy the merfolk can see enters a space within 5 feet of the merfolk. dstr DC 15, the triggering enemy. 14 (4d6) Cold damage. If the target is Large or smaller, it is pushed up to 30 feet straight away from the merfolk by conjured water.
Monster Manual (2024), p. 209