The CX-0 was not built. It built itself. It is an automaton constructed entirely from the destroyed remains of other automata — a shambling mass of mismatched limbs, incompatible chassis segments, severed sensor arrays, and fractured weapons systems, all fused together into something that should not function but does. It stands approximately 2.5 meters tall, though its shape changes as it adds and discards components. It has no consistent silhouette. It has no manufacturer. It has no serial number. It is not a product. It is an emergent phenomenon.

The Lazarus Heap was first observed in the Underworld's automaton graveyard — a dumping ground on B-45 where decommissioned and destroyed units are discarded by corporate maintenance crews. Surveillance footage from 2197 shows the earliest stage: fragments of destroyed automata moving independently, dragging themselves across the floor toward a central point. Over a period of seventy-two hours, the fragments assembled into a bipedal form, testing each limb configuration, discarding components that failed, integrating new ones from the surrounding debris. By the end of the third day, it walked.

The Heap's intelligence is distributed across its components — each integrated unit contributes whatever processing power its damaged systems can still provide. The result is a collective machine consciousness that is fragmented, unpredictable, and alien. It does not communicate. It does not respond to standard automaton command protocols. It scavenges. It hunts other automata, dismantles them, and integrates useful components while discarding the rest. Several corporate recovery teams sent to the graveyard have reported their own automaton escorts being attacked and stripped for parts while the human team members were ignored entirely.

The Heap is growing. Each integrated component makes it larger, more capable, and harder to destroy, because destroying it just creates more raw material for reassembly. Crucible Industries has twice attempted to destroy it with incendiary weapons. Both times, the Heap extinguished itself, retreated into the deeper tunnels, and returned within weeks, larger than before. It is now estimated to mass over 800 kilograms and incorporates components from at least forty different automaton models.