Sources
CR
Type
Size
Alignment
Movement

Shell Shark

Medium Monstrosity, Unaligned

Armor Class 18 (shell plate armor)
Hit Points 32 (5d8 + 10)
Speed 0 ft., swim 40 ft.
STR
15
+2
DEX
12
+1
CON
14
+2
INT
3
-4
WIS
10
+0
CHA
7
-2
Saving Throws STR +6
Skills Athletics +6
Senses darkvision 120 ft., passive Perception 10
Languages
Challenge 2 (450 XP)

Traits

Blood Frenzy. The shark has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Magic Resistance. The shark has advantage on saving throws against spells and other magical effects.

Water Breathing. The shark can breathe only underwater.

Actions

Multiattack. The shark makes two bite attacks.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:13 (2d10 + 2) piercing damage.

Lore

These impressive creatures, swimming through the sahuagin stronghold in The Final Enemy, are chosen by priestesses of Sekolah to serve as protectors and messengers. The sharks are blessed in a ritual during which plates of shell and coral are permanently affixed to their bodies.