Ankylosaurus

Huge beast, 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)
Senses passive Perception 11
Languages -
Challenge 3 (700 XP)
ACTIONS

Tail. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 18 (4d6 + 4) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Thick armor plating covers the body of the plant-eating dinosaur ankylosaurus, which defends itself against predators with a knobbed tail that delivers a devastating strike.
Monster Manual (SRD) D&D 5 › Monsters