Gearkeeper construct

Gearkeeper constructs, or simply gearkeepers' are spherical automatons mostly powered by arcane means with a little help from a clockwork mechanism that power its locomotion aspect.

Appearance
Gearkeeper constructs are covered with metal plates and weaponized with curved blades. The particular model, Gear Warden, was about eight feet in diameter, a construct of three layers of overlapping metal plates, clockwork gears, twelve blades, and at least two spears. It had a retractable lens, covered by a plate for protection.

Abilities
Gearkeeper constructs are resistant to bludgeoning, piercing, and slashing damage from nonmagical attacks. They also immune to fire, poison, psychic damage and charmed, exhaustion, frightened, paralyzed, petrified, poisoned condition, and immune to any spells or effects that would alter their form. Opportunity attacks made against the gearkeeper have disadvantage.

Gearkeepers can attempt to roll over its target who must succeed on an Athletics or Acrobatics check, or take bludgeoning damage and knocked prone.


 * Whirling Blades: Any creature that starts its turn within 5 feet of the gearkeeper takes 4 (1d8) slashing damage.
 * 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.
 * Multiattack: The gearkeeper makes two Arm Blade attacks, or one Arm Blade attack and one Spear Launcher attack.
 * Arm Blade: Melee weapon attack with +9 to hit and reach 5 ft. made on one target. If hits, deals 18 (3d8 + 5) slashing damage.
 * Spear Launcher: Ranged weapon attack with +9 to hit and range 90 ft. made on one target. If hits, deals 12 (2d6 + 5) piercing damage, and the target is knocked prone or pinned to a surface.

History
Originally, they were developed by tinkerers and mage engineers to be sentries and guardians of vaults during the Age of Arcanum. Many of them were ruined during the downfall of arcane societies, after the Calamity, when the rest outlived their creators, still patrolling the ruins of ancient cities. In the post-Divergence era, "a number" of tinkerers have produced updated versions of the gearkeepers, reverse engineering them from the recovered shells and scraps. As of 835 PD, such designs were only "recently" began their demployment in select prisons, or by wealthy collectors.