Crumbling Colossus.

When the statue drops to 0 hit points, it crumbles and is destroyed. Any creature on the ground within 30 feet of the crumbling statue must make a DC 22 Dexterity saving throw, taking 22 (4d10) bludgeoning damage on a failed save, or half as much damage on a successful one.

Immutable Form.

The statue is immune to any spell or effect that would alter its form.

Magic Resistance.

The statue has advantage on saving throws against spells and other magical effects.

Siege Monster.

The statue deals double damage to objects and structures.

Actions

Multiattack.

The statue makes two melee attacks.

Slam.

Melee Weapon Attack: +16 to hit, reach 5 ft., one target. Hit: 29 (3d12 + 10) bludgeoning damage.

Hurled Stone.

Ranged Weapon Attack: +16 to hit, range 200/800 ft., one target. Hit: 43 (6d10 + 10) bludgeoning damage.

Walking Statue of Waterdeep