Sources
CR
Type
Size
Alignment
Movement

Giant Shark Skeleton

Huge Undead, Unaligned

Armor Class 13 (natural armor)
Hit Points 126 (11d12 + 55)
Speed 20 ft., swim 50 ft.
STR
23
+6
DEX
11
+0
CON
21
+5
INT
1
-5
WIS
10
+0
CHA
5
-3
Skills Perception +3
Damage Vulnerabilities bludgeoning
Damage Immunities poison
Condition Immunities Exhaustion, Poisoned
Senses blindsight 60 ft., passive Perception 13
Languages
Challenge 5 (1,800 XP)

Traits

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

Actions

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit:22 (3d10 + 6) piercing damage.

Lore

A giant shark is 30 feet long and normally found in deep oceans. Utterly fearless, it preys on anything that crosses its path, including whales and ships.