Thunderbeast Skeleton

Huge Undead, Unaligned

STR
19 (+4)
DEX
11 (+0)
CON
15 (+2)
INT
2 (-4)
WIS
12 (+1)
CHA
5 (-3)

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.

Find this creature in the encounter builder

Thunderbeast Skeleton

Source: Storm King's Thunder, p. 99 - Licenses and attribution