Gearkeeper Construct

Large Construct - Unaligned
Armor Class: 18 (Natural Armor)
Hit Points: 161 (17d10+68)
Speed: 60ft
STR - 20, DEX - 16, CON - 18, WIS – 11, INT - 3, CHA - 1
Damage Resistances: Bludgeoning, Piercing, and Slashing from nonmagical attacks
Damage Immunities: Fire, Poison, Psychic
Condition Immunities: Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Senses: Blindsight 120ft, Passive Perception 10
Languages: Understands the languages of its creator but can't speak
Challenge: 10

Traits
Immutable Form - The gearkeeper is immune to any spell or effect that would alter its form.
Rapid Shifting - Opportunity attacks made against the gearkeeper have disadvantage.
Whirling Blades - Any creature that starts its turn within 5 feet of the gearkeeper takes 4 (1d8) slashing damage.
Actions
Multiattack - The gearkeeper makes two Arm Blade attacks, or one Arm Blade attack and one Spear Launcher attack.
Arm Blade - Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) slashing damage.
Spear Launcher - Ranged Weapon Attack: +9 to hit, range 90 ft., one target. Hit: 12 (2d6 + 5) piercing damage, and the target is knocked prone.
Shrapnel Blast - Recharge 6 - The gearkeeper jettisons a spray of jagged metal in a 30-foot cone. Each creature in the area must make a DC: 15 Dexterity saving throw, taking 21 (6d6) piercing damage on a failed save, or half as much damage on a successful one.