Automaton Type-B3 “Cataclysm Enforcer”

Siege Engine of Law. The B3 deals double damage to objects and structures.

Lawfield Generator. Any chaotic creature that starts its turn within 30 feet of the B3 must succeed on a DC 20 Wisdom saving throw or be stunned until the start of its next turn as their mind is bombarded with the oppressive order of Mechanus.

Harmonic Core. Whenever the B3 drops to 0 hit points, it emits a final Law Pulse, dealing 50 (10d10) radiant damage in a 60-foot radius (DC 21 Con save for half).

Marching Commander. Allied constructs within 120 feet of the B3 gain advantage on saving throws against frightened and charmed effects, and their attack rolls increase by +2.

Multiattack. The B3 makes three attacks: two Siege Fists and one Lawfire Cannon.

Siege Fist. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 33 (4d12 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 22 Strength saving throw or be knocked prone.

Lawfire Cannon. Ranged Weapon Attack: +14 to hit, range 120/360 ft., one target. Hit: 45 (10d8) radiant damage. On a critical hit, the target must succeed on a DC 20 Con save or be banished to Mechanus for 1 minute (as the energy displaces them across the planes).

Pulse Detonation (Recharge 5–6). The B3 releases a 360-degree radiant-thunder pulse. All creatures of its choice in a 60-foot radius must make a DC 21 Constitution saving throw, taking 60 (12d10) radiant damage and 33 (6d10) thunder damage on a failed save, or half as much on a success. Creatures that fail are also pushed 30 feet away and knocked prone.

Legendary Actions (3 per round)

• Crushing Step. The B3 moves up to half its speed without provoking opportunity attacks and can trample creatures it moves over. Those creatures must succeed on a DC 22 Dexterity saving throw or take 21 (6d6) bludgeoning damage and be knocked prone.

• Arcane Overload. It recharges its Lawfire Cannon or immediately fires it at one target within range.

• Marching Order. Up to 5 allied constructs within 120 ft. can use their reaction to move up to their speed and make one weapon attack.