Iron Sphere

An iron ball covered in black panels sits at the statue’s feet. It seems slightly out of place, its surface smooth and bright.

Hidden Threat. From a distance, the iron sphere appears to be a ball four feet in diameter. Closer inspection reveals square plates in the sphere, each crowned by a black hemisphere. Iron spheres usually find placement as art objects, sometimes incorporated into statuary displays or among white stones, vases, or other decorative notions.

Unpredictable Opponent. Once the iron sphere becomes active, it rolls toward a threat, deploying what weapons it deems necessary by means of the pistons beneath each plate on its exterior. Some pop open like a chest’s lid, some fire outward, and others split open to reveal a blade, a spike, or a nozzle.

Direct Control or Set to Guard. The owner of an iron sphere gives it commands through a gem, which can be concealed inside the plate at the topmost part of the sphere when not being used to control the sphere.

Construct Nature. The iron sphere doesn’t require air, food, drink, or sleep.

Iron Sphere

Small construct, unaligned
Armor Class 16 (natural armor)
Hit Points 60 (8d6 + 32)
Speed 30 ft., burrow 10 ft., climb 20 ft.
16 (+3) 13 (+1) 18 (+4) 4 (-3) 10 (+0) 3 (-4)

Skills Athletics +6, Perception +3
Damage Resistances cold, fire; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities lightning, necrotic, poison, psychic, radiant
Condition Immunities charmed, exhaustion, frightened, poisoned, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 13
Languages understands the languages of its creator but can’t speak
Challenge 5 (1,800 XP)

Immutable Form. The sphere is immune to any spell or effect that would alter its form.

Siege Monster. The sphere deals double damage to objects and structures.

Standing Leap. The sphere can launch itself into the air by extending the rods within it like pistons. The sphere’s long jump is up to 25 feet and its high jump is up to 15 feet, with or without a running start.

Tunneler. The sphere can burrow through solid rock at half its burrow speed and leaves a 5-foot-wide, 5-foot-high tunnel in its wake.


Multiattack. The iron sphere makes three melee attacks.

Blade. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage.

Piston. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage.

Spike. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage.

Lightning Cannon (Recharge 5-6). The sphere extends a metal rod from one of its many facets and fires a bolt of lightning in a 20-foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 22 (4d10) lightning damage on a failed save, or half as much damage on a successful one.

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