Sources
CR
Type
Size
Alignment
Movement

Reef Shark

Medium Beast, Unaligned

Armor Class 12 (natural armor)
Hit Points 22 (4d8 + 4)
Speed 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
Challenge 1/2 (100 XP)

Traits

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 feet 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.

Lore

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.