Merfolk

Medium humanoid (merfolk), neutral
Armor Class 11
Hit Points 11 (2d8 + 2)
Speed 10 ft., swim 40 ft.
STR
10 (+0)
DEX
13 (+1)
CON
12 (+1)
INT
11 (+0)
WIS
11 (+0)
CHA
12 (+1)
Skills Perception +2
Senses passive Perception 12
Languages Aquan, Common
Challenge 1/8 (25 XP)

Amphibious. The merfolk can breathe air and water.

ACTIONS

Spear. Melee or Ranged Weapon Attack: +2 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 3 (1d6) piercing damage, or 4 (1d8) piercing damage if used with two hands to make a melee attack.

Merfolk are aquatic humanoids with the lower body of a fish. They live in small tribes beneath the waves.
Monster Manual (SRD) D&D 5 › Monsters