Sources
CR
Type
Size
Alignment
Movement

Stonecloak

Large Construct, Unaligned

Armor Class 17 (natural armor)
Hit Points 178 (17d10 + 85)
Speed 30 ft.
STR
22
+6
DEX
9
-1
CON
20
+5
INT
9
-1
WIS
11
+0
CHA
9
-1
Damage Immunities poison, psychic; bludgeoning, piercing, slashing, from nonmagical attacks that aren't adamantine
Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Senses darkvision 120 ft., passive Perception 10
Languages understands Abyssal, Celestial, Common, Draconic, Dwarvish, Elvish, Infernal, and Undercommon but can't speak
Challenge 10 (5,900 XP)

Traits

Immutable Form. The stonecloak is immune to any spell or effect that would alter its form.

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

Magic Weapons. The stonecloak's weapon attacks are magical.

Actions

Multiattack. The stonecloak makes two slam attacks.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit:19 (3d8 + 6) bludgeoning damage.

Slow (Recharge 5–6). The stonecloak targets one or more creatures it can see within 10 feet of it. Each target must make a DC 17 Wisdom saving throw against this magic. On a failed save, a target can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the target can take either an action or a bonus action on its turn, not both. These effects last for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Lore

Stone golems are magical constructs cut and chiseled from stone to appear as tall, impressive statues. Like other golems, they are nearly impervious to spells and ordinary weapons.