The focus of our probing expedition was to be a star deep within Path Kethona, on the outskirts of the Spider nebula. This star had over a million years ago attracted the attention of a female of the now-subsumed rate called Theoreticals. She had been called Boundless. Soon after her death, her rate had been forcibly merged with the Builders.

Boundless had persisted in her studies throughout her long life, in defiance of Warrior orders. The reason why Warriors wanted this particular star left unstudied was never explained. Perhaps they didn’t themselves know. She was finally prosecuted for her defiance—I assume by Juridicals.

Perhaps you know of her case. No? Conveniently lost or forgotten, I suppose. Those millennia were harsh times indeed.

Her studies were suppressed, and she herself forced to enter a Cryptum that turned out to be defective, perhaps sabotaged. A thousand years after she entered, her Cryptum was opened, her death discovered, and her remains quietly disposed of by a small group of former students.

There is an odd story that for tens of thousands of years after her death, Haruspis kept finding her suppressed information floating to the fore in Domain studies. The Domain was favoring her, some claimed—but those tales are now considered legendary.

Still, I have always wondered.

A century before the Didact entered his Cryptum, I found a hard copy of Boundless’s studies preserved in the collection of a former Theoretical on Keth Sidon. Reading this copy, I was curious as to how all the odd facts Boundless had compiled about Path Kethona seemed to fit into a hypothesis emerging from my studies of human genetics.

Humans very likely originated on Erde-Tyrene. But they long ago abandoned that world and moved outward, setting up population centers around two other suns dozens of light-years away, then stringing outposts across almost thirty thousand light-years, out toward the margin of our galaxy.

Forerunners were aware of humans, of course, and tracked their growing populations, their predatory colonial habits. At that time, our boundaries did not merge. Humans were likely to be very troublesome, many thought—but not then. Not yet.

In just a few centuries those human outposts became very populous indeed and would later, during the following conflicts, absorb the brunt of early attacks by the Flood.

But who else had been aware of humans long before the Flood—of humans and perhaps also of Forerunners?

* * *

Keeper approached me and said, in a low voice, “We are on the lookout for neural physics architecture, true?”

“True enough.”

“We’re assuming that Precursors also reached out this far.”

“Assume nothing,” I said. “But search … yes.”

We now made six closely spaced jumps of a few light-years apiece. At the last jump, Audacity opened a small portal from which we might later choose, at will, a wide conical selection of future jumps.

In case we needed to depart Path Kethona quickly.

For many hours, we drifted in and out of the shock wave of our chosen star’s plume of ionized plasma, waving and furling over ten billion kilometers like an immense candle flame dancing in a soft breeze, as it intersected the more diffuse but steady output of a local cluster of suns.

“Four rocky planets,” Keeper announced. The small crew showed little outward excitement. Young and self-impressed, I thought, but still keeping taut discipline.

“And five anomalous masses,” Dawn added, pointing them out in virtual perspective.

“You theorized these masses existed before the sensors reported them,” I said. “How?”

“Slight deviations in the starfield. Very slight.”

“And perturbations in the orbits of two planets,” Keeper said, nodding in admiration at his crewmate’s sensitivity.

“They’re uniform in mass, appear to be uniform in diameter.… Could be failed stars,” Dawn suggested.

“Perhaps,” Keeper said. “But failed stars still release heat, if not visible light. These masses are colder than the interstellar void.”

The quiet that followed was properly respectful. We were thinking the same thoughts. We had seen similar masses before—in our schooling. Only a few still existed in our home galaxy.

“Precursor anchors?” Keeper asked.

“No visible bridges or threads linking them, or out between the stars,” Dawn said. “Not in this system. Not now.”

Even dormant, such constructs were thought to be unstable—perhaps dangerous. Audacity’s ancilla supplied us with records of previous Forerunner encounters. They were not encouraging. Ships vanishing … Surviving crews requiring extensive proto-geometric therapy to return their minds to a proper neural topology.

My crew was unsettled, but undeterred.

“We’ll approach with caution,” I suggested.

Keeper and Dawn linked their armor to mine, and together with Audacity we plotted a fine course across the two billion kilometers that separated us from the closest dark mass.

As a precaution, our armor locked our positions and reduced our chemistry. During the next few days, as our vessel followed a long hyperbolic orbit to the nearest cold, dark mass, we allowed Audacity to refresh our memories on Precursor architecture and all the other mysterious artifacts Forerunners had encountered, some of them billions of years old.

Assuming nothing … and yet knowing, as if by instinct, that we were close to the heart of a controversy that had perplexed Forerunners for hundreds of thousands of years.

Was Path Kethona the source of the Precursors? Or had it been the birth galaxy of another great, more primary race, active even before the Precursors … Or a race before that, on and on back through time to the great Glow itself?

Minds simmering under the tutelage of our ancillas, our bodies moved slow as glass as our ship plunged deeper into the system.

STRING 5

CATALOG

THE JURIDICAL NETWORK briefly opens, and Catalog takes the opportunity to send what it has gathered, then to supplement its understanding of the Librarian’s testimony.

In another system, Juridicals have deposed the Ur-Didact. Catalog is provided selections relevant to the Lifeshaper’s testimony, but she cannot be informed of his survival.

UR-DIDACT

After the capture of my ship in the San’Shyuum quarantine system, the Master Builder locked me into a weapons-grade stasis bubble, like some dangerous bomb.

I have no awareness of the time between.

Then: the deafening peal of a great bell, followed by a smoky ozone stench. The bubble collapsed. All the years of pent-up time rushed in at once and singed my outer skin. That is the way of such bubbles; they are designed to contain and render harmless more than to delicately preserve.

Dropping to the floor in a heap, I wiped a thin layer of ash from around my eyes and tried to estimate, from my weakness, how long I had been in the bubble. My eyes would not focus. My arms and legs trembled. I could barely rise to my feet.

At least a year.

I was aboard a ship—not small, apparently deserted. The bubble had been abandoned in long-term stowage. The compartment had a physical hatch, not locked; lighting dim. Sounds not encouraging: ratcheting, ragged ticking, distant, mournful scraping. An old vessel in poor repair.

Still gathering my wits, I stumbled out of the compartment and down a curving hallway to a transit tube. The tube refused to work. Pressing against the tube’s sides, I twisted and wormed my way to the next open compartment—another stowage area.

Here I found four more military-grade stasis bubbles shoved into a corner. By the thin whine they made, and the flickering view of their contents, I judged they would soon collapse as mine had.

I pulled and shoved the bubbles apart and stood between them on the deck, watching their opacities flow like clouds in a sky. Gradually, I dimly made out a Builder, still wearing armor. The second, possibly a member of Builder Security, without armor—caught halfway between Warrior-Servant physiology and a newer pattern.

The third, in its carapace: Catalog. A Juridical gatherer of information. Of little use in the present circumstance. Juridicals and I have never gotten along. They dogged our every movement in the last phases of the human-Forerunner war.

No sign of the Manipular I had imprinted, nor of the two humans who had accompanied us. Given the Master Builder’s temper and his obsession with fighting the Flood, I suspect they were delivered to one of his research centers and met a bad end.

For the moment, I left the bubbles where they were and made my way to what I assumed was an inboard helm, a compartment ill-lit, bleak, and filthy with layers of organic debris.

Deserted.

Worse and worse. An unauthorized trading ship or some piece of confiscated junk. At least it was Forerunner. I climbed to the next level, the main bridge.

A restless unease in my gut warned me that gravity on these decks might fail at any moment. Very dangerous—gravity gradients are not to be ignored. I could be slammed up or thrown sideways, smashed to a pulp. As any warrior will tell you, unbalanced gravity is a [TT: expletive, possibly sacrilegious, untranslatable].

I walked around the bridge. The equipment was older than the ships we had fought with at Charum Hakkor. The Master Builder was nothing if not frugal with the way he disposed of his enemies. I wondered where he had found this one—perhaps in some surplus yard on an outlying planet, or a salvage orbit around one of his construction facilities.

I shouted instructions. No response. No ancilla presented itself either to assist or to deny me access.

Pushing aside dust and desiccated scraps of what might have been flesh, I spit onto a clear panel to clear what looked like dried blood. Clearly this vessel had seen desperate action. But what sort?

Through the smeared panel, lights faintly glowed. I swiped the surface again. The lights brightened—then flickered, threatened to go dark. The ship was still functioning—but just barely.

At least the air was not freezing—and still breathable, but dense, stale.

How far had we traveled, for how long, and from where?

To where?

A disquieting thought … That we had been sent on a long journey to no system in particular, moving at less than light speed, without benefit of jump or portal. When the power to the stasis bubbles declined, mine opened—to release me into a limbo of slow decline and death.

Was it possible I had underestimated the moral degeneracy or the raging fury of the Master Builder?

The panel lights glowed brighter. I danced my fingers over the panel and managed to summon a grainy display of what lay forward of the ship: a planetary limb, reddish and angry. I thought I recognized a distinctive swirl of continents, like paint stirred with a stick—a unique tectonic formation. This could be Uthera Midgeerrd, on the extreme outer reaches of the Forerunner ecumene, less than a hundred light-years from the unpatrolled borders of the galactic margin.

Before I entered the Cryptum, Uthera had been regarded as a far-flung outpost of Forerunner culture and design, distinctly anti-Builder in its sympathies, populated by half-renegade Miners and others who had deserted their rates. Perhaps the Master Builder found delicious irony in sending a Promethean to this undisciplined place.

Movement behind me. I turned to see a face peer over the rim of the transit tube. With a slow, cold shock, I recognized a fellow veteran of the human wars, a commander of one of my tactical squadrons—known at the time as Sharp-by-Striking.

“Distinguished company!” he murmured. “Is this the veritable Didact, come to join me in exile?” He pulled himself into the compartment and stretched his arms. He appeared much reduced by hardship—paler, very thin. “There are still two others … Harsh stasis. Doesn’t look good down there.”

We approached each other warily, then crossed arms, caught up in ancient emotions—not all of them pleasant. Sharp had opposed my grand strategy and been instrumental in convincing the Old Council my Shield Worlds were unworkable.

All that, of course, meant nothing now.

He peered at the display. “Is that Uthera?” he asked. “Not encouraging. I’ve served on Flood watch on one hulk after another for almost a century, a thousand light-years and more from here. Now … Uthera! My well-deserved reward for serving Builders. But you! I had heard rumors. Released from your Cryptum…”

“Our situation,” I interrupted, with the gentlest command voice. “Tell me what you know.”

“Well, for one, we’re in a Burn,” he said with an unhappy click.

“I don’t know what that is.”

“No ancillas, no armor…” He examined his hands and curled his fingers as if they were unfamiliar. “Weak as newborns. A Burn is a thema or margin arc lost to the Flood. This entire system is infested. Likely every surrounding system as well, for dozens of light-years.” He dropped his shoulders. “Once you trained me, Didact. I have failed. I am yours to punish as you see fit.”

I have difficulty forgiving those who have brought harm to those I respect and admire. But Sharp-by-Striking was a pitiful shadow of what he had once been.

As for myself—

Little better.

“Looks like we’re stuck with each other,” I said. “You know this hulk and what it’s capable of?”

He drew himself up again and took a deep breath.

“A Builder reject, stockpiled against direct orders to scuttle and send to salvage. It should have been recycled long ago. Instead, it’s been put to use where success was unlikely, to replace newer, far more expensive ships. I’ve served on several. Hard duty, Didact.” He swallowed and grimaced. “Builders are ever driven by power and profit. I did my best to serve the ecumene.”

“No doubt,” I said.

Now Sharp turned his own self-loathing into cold, outward anger, an old tactic among Warriors who had survived defeat. “Someone has to have ordered this one into the Burn, against any sensible plan. If there are other vessels … they might have all been overtaken, commandeered by the Flood, used to spread contagion.” His eyes narrowed and he groaned deep in his chest. “We’re on a plague ship!”