Sources
CR
Type
Size
Alignment
Movement

Thunderbeast Skeleton

Huge Undead, Unaligned

Armor Class 15 (natural armor)
Hit Points 68 (8d12 + 16)
Speed 30 ft.
STR
19
+4
DEX
11
+0
CON
15
+2
INT
2
-4
WIS
12
+1
CHA
5
-3
Damage Vulnerabilities bludgeoning
Damage Immunities poison
Condition Immunities Poisoned, Exhaustion
Senses darkvision 60 ft., passive Perception 11
Languages
Challenge 3 (700 XP)

Actions

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., Hit:18 (4d6 + 4) piercing damage.

Tail. +7 to hit, reach 10 ft., one target. Hit:18 (4d6 + 4) bludgeoning damage. Succeed on a DC14 Strength saving throw or be knocked prone.