Immutable Form. The golem is immune to any spell or effect that would alter its form.
Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.
Magic Weapons. The golem's weapon attacks are magical.
False Appearance. If the golem remains motionless, it it is indistinguishable from a large pile of rubble or rocks.
Multiattack. The golem makes two slam attacks.
Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.
Boulder Barrage (Recharge 5–6). Each creature of the golem's choice in a 20ft cube within 60ft must make a DC 15 Dexterity save or take 6d6 bludgeoning damage save for half.
Description
Boulder golems are magical constructs constructed from rock or rubble. Boulder Golems are excellent sentries for wizards or other spells casters and use their ability to look like a normal pile of rocks to ambush their foes. Like other golems, they are nearly impervious to spells and ordinary weapons.