Walking Statues of Waterdeep

Gargantuan construct Unaligned Armor Class:  17 (natural armor) hit Points:  314 (17d20 + 136) Speed:  60ft.

Str 30(+15) Dex 8(-1) Con 27(+8) Wis 10 Int 1(-4) Cha 1(-4)

Saving Throws:  Con: +14 Damage Immunities:  cold, fire, poison, psychic; and bludgeoning, piercing and slashing, from nonmagical attacks not made with adamantine weapons Condition Immunities:  charmed, exhaustion, frightened, paralyzed, petrified, poisoned, stunned Senses:  truesight 120 ft., passive perception 10

Traits 
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 DC22 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.