Lively Floating Armor
Habitat: Urban; Treasure: None
Whether animated by a lingering spirit or a sorcerer’s magic, animated armor is driven by a singular purpose. It might stand guard over its creator’s keep or relentlessly pursue those who have wronged it. No matter the task, it will continue until defeated.
Exceptional Armor
On rare occasions, enchanted armor is brought to life. When this happens, its animated form can gain one of the following properties:
Adamantium. Any Critical Hit against the animated armor becomes a normal hit.
Magic Armor. The animated armor’s AC increases by the armor’s magic bonus.
Mithral. The animated armor’s Fly Speed increases by 10 feet.
Resistance. The animated armor has resistance to the same type of damage as the armor provides.
Animated Chain Shirt
Forged from interlocking metal rings, an animated chain shirt can shift and extend its links, forming whip-like tendrils to lash at distant foes.
Animated Half Plate Armor
Suspended in midair as separate plates, animated half plate armor moves fluidly across the battlefield. It can reassemble around its enemies, crushing them with relentless force.
Animated Chain Shirt
Small Construct, Unaligned
Armor Class 15
Hit Points 44 (8d6 + 16)
Speed 0 ft., Fly 30 ft.
Initiative +3 (13)
MOD | SAVE | ||
STR | 13 | +1 | +1 |
INT | 1 | -5 | -5 |
MOD | SAVE | ||
DEX | 16 | +3 | +3 |
WIS | 3 | -4 | -4 |
MOD | SAVE | ||
CON | 14 | +2 | +2 |
CHA | 1 | -5 | -5 |
Immunities Poison, Psychic; Charmed, Deafened, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Senses Blindsight 60 ft., Passive Perception 6
Languages None
CR 2 (XP 450; PB +2)
Actions
Multiattack. The chain shirt makes two Whip attacks.
Whip. Melee Weapon Attack: +5, reach 15 ft. Hit: 8 (2d4 + 3) Slashing damage.
Whirlwind (Recharge 5–6). Dexterity Saving Throw: DC 13, each creature in a 15-foot Emanation originating from the chain shirt. Failure: 12 (5d4) Slashing damage. Success: Half-damage.
Animated Half Plate Armor
Small Construct, Unaligned
Armor Class 17
Hit Points 88 (16d6 + 32)
Speed 0 ft., Fly 30 ft.
Initiative +4 (14)
MOD | SAVE | ||
STR | 14 | +2 | +2 |
INT | 1 | -5 | -5 |
MOD | SAVE | ||
DEX | 18 | +4 | +4 |
WIS | 3 | -4 | -4 |
MOD | SAVE | ||
CON | 15 | +2 | +2 |
CHA | 1 | -5 | -5 |
Immunities Poison, Psychic; Charmed, Deafened, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Senses Blindsight 60 ft., Passive Perception 6
Languages None
CR 4 (XP 1,100; PB +2)
Traits
Separate. The armor can separate into individual pieces allowing it to move through a hostile creature’s space.
Actions
Multiattack. The armor makes two Slam attacks.
Slam. Melee Weapon Attack: +6, reach 5 ft. Hit: 14 (3d6 + 4) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Grappled condition (escape DC 14). Until the grapple ends, the target has the Restrained condition and it takes 3 (1d6) Bludgeoning damage at the start of each of its turns. The armor can have only one creature Grappled by this action at a time.

Downloads
Further Reading
Instead of an entire suit of magical armor, perhaps only a gauntlet is magical, like a wind-up gauntlet.
When beast and machine meet, you get these creatures.
Imagery created with Midjourney.