Armor Class 16 (natural armor)
Hit Points 52 (7d8 + 21)
Speed 30 ft.
Damage Immunities poison, [object Object]
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 60 ft., passive Perception 10
Languages understands one language of its creator but can't speak
Challenge 4
False Appearance. While the stone defender remains motionless against an uneven earthen or stone surface, it is indistinguishable from that surface.
Magic Resistance. The stone defender has advantage on saving throws against spells and other magical effects.
Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage, and if the target is Large or smaller, it is knocked prone.
Intercept Attack. In response to another creature within 5 feet of it being hit by an attack roll, the stone defender gives that creature a +5 bonus to its AC against that attack, potentially causing a miss. To use this ability, the stone defender must be able to see the creature and the attacker.
Mordenkainen's Tome of Foes, p. 126