Hive Tenebris was a column.
Tens of thousands of floors stacked vertically over centuries, each level built upon the last, the whole structure rising from the planet's surface to the upper atmosphere. The Spire sat at the top, the Mid-Hive ford the vast inhabited middle, and the Underhive occupied the ancient foundations below. The higher the level, the more defensible — but the noble estates extended their infrastructure downward, threading critical systems deep into the structure to keep dangerous things away from living quarters.
Sewage processing. Air recirculation. Power generation.
Especially power generation. No sensible noble house wanted to sleep directly above a controlled fusion reactor. The reactors went as deep as practical — close to the Mid-Hive boundary, far from the residential levels, serviced by maintenance crews who made infrequent visits along routes that had been mapped and forgotten and remapped again over generations.
Forgotten routes.
Ancient maintenance corridors, removed from current schematics, known to nobody living.
The Aeldari warrior had found one.
She moved through the passage without light, using her helt's sensors, killing the two guards at the maintenance checkpoint before either could reach their vox. She used the senior engineer's severed hand to open the secondary access, killed everyone in the control room before the first alarm trigger was reached, and stood at the reactor console.
The control system was human-made. She read it in approximately four seconds.
Aeldari intelligence operated on a different scale from the species they called mon-keigh. They had been studying humanity's technology since before the Imperium existed. Every major noble house used variants of the sa reactor design. She knew the interface the way a surgeon knows anatomy — not because she had trained on this specific console, but because she understood the underlying principles completely.
Overcharge protocol. Confird.
The system required two operators at two separate consoles, thirty tres apart — a safeguard against single-operator accidents.
She stood at one console. She severed a technician's hand at the wrist, levitated it psychically, positioned it at the second console, and pressed both activation points simultaneously.
Overcharge protocol initiated. Warning: sustained operation will result in reactor thermal exceedance. Verify cooling systems operational.
The hard part was not starting the overload. The hard part was ensuring it beca catastrophic rather than rely damaging.
The reactor's machine-spirit had safety systems. Primary among them: four alloy support columns attached to the reactor core, each one as thick as a human thigh. If thermal sensors registered dangerous overheating, these columns would forcibly extract the reaction core from the containnt vessel — separating fuel from the reaction environnt and terminating the process.
She climbed to the reactor's upper housing and cut all four columns with the power blade.
The safety extraction system ceased to exist as a functional chanism.
She descended, cut the primary cooling conduits in three places, stepped back from the spreading blue coolant pooling across the floor, and reached to her belt.
A sphere. Approximately the size of a recreational ball used in human table sports. She set the tir — ten minutes — and threw it into the reactor housing.
Then she ran.
The device she had thrown was a nuclear grenade.
This was, by any standard, an impressive piece of engineering. A weapon with thirty-tre lethal radius, a genuine nuclear yield, small enough to be carried on a belt.
Against the Zeppelin estate's defences directly, it would have accomplished nothing worth the effort. Thirty tres of blast radius against a fortress with kilotres of layered defence.
Against a fusion reactor already in thermal runaway, with its safety systems disabled and its cooling feeds severed — it was a fuse.
The reactor's machine-spirit registered critical overheating approximately four minutes after she left. The temperature climbed through engineering paraters, through ergency thresholds, through the values that had no designated response because they represented outcos the designers had not wanted to model. The plasteel walls surrounding the reactor began to discolour, then to smoke.
The grenade detonated.
Thirty tres of nuclear blast in a confined space. Not large, by military standards — comparable to a heavy artillery shell in its imdiate physical effect.
But the chain reaction it initiated was not contained to thirty tres.
It touched the fuel rods of an already-supercritical fusion reactor with no cooling, no safety extraction, and no containnt integrity remaining.
The yield of what followed was approximately fifty gatons.
Kian felt it before he saw it.
The second tremor was not like the first. The first had been a warning — structural distress, energy release, a problem sowhere below. This was different in the way that a building shifting on its foundation differs from a building ceasing to exist.
The floor moved. Not vibrated. Moved. The marble parapet cracked along its entire length. Sowhere below them, in the levels that housed the Mid-Hive, the energy of fifty gatons was propagating outward through hundreds of floors of concrete, plasteel, rebar, and the bodies of millions of people.
The ceiling panels of the mid-levels — each one representing tens of thousands of tonnes of accumulated structure — flexed like water. People standing on them were launched upward and ca down.
Buildings in the Mid-Hive that had stood for centuries collapsed in seconds.
The shockwave propagated upward through fifty floors before it reached the surface, attenuated but still carrying enough energy to push Kian's radiation counter past a thousand tis safe threshold and open a wound in the Spire's upper structure several football fields wide.
Kian stood in the darkness — the power failure had taken every light simultaneously — with his helt's sensors registering numbers that had no normal context.
His private soldiers were still at their posts. His orders had held.
In the levels below, three hundred thousand people died in the first minute.
Twenty million more had been exposed to radiation that would work through them at varying speeds over the weeks and months to co.
The Hive was not going to be the sa place it had been this morning.
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