Monster

Reef Shark

Smaller than giant sharks and hunter sharks, reef sharks inhabit shallow waters and coral reefs, gathering in small packs to hunt. A full-grown specimen measures 6 to 10 feet long.

Medium beast, unaligned

Armor Class: 12 (natural armor)
Hit Points: 22 (4d8 + 4)
Speed: 0 ft., swim 40 ft.

STR: 14 (+2)
DEX: 13 (+1)
CON: 13 (+1)
INT: 1 (-5)
WIS: 10 (+0)
CHA: 4 (-3)

Skills: Perception +2
Senses: blindsight 30 ft., passive Perception 12
Languages: None
Challenge: 1/2 (100 XP)
Proficiency Bonus: +2

Pack Tactics. The shark has advantage on an attack roll against a creature if at least one of the shark's allies is within 5 ft. of the creature and the ally isn't incapacitated.

Water Breathing. The shark can breathe only underwater.

Actions

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage.