Rise of the Horde

The first courier carrying word of the wall-mount engagement reached the Arch the morning after Arka'garr's report went out, having traveled through the night.

Aliyah read it at the instrument room's main station, with Darak beside her.

Eight entities, two hours, five dissolved on contact, three finished by the garrison, two minor injuries, the arc holding.

She read it twice and felt something she had not expected: relief that was almost separate from the report's content, relief that the thing they had raced toward for weeks had arrived and the arc had simply done what it was built to do.

"Eleven days early," Darak said, reading over her shoulder. "Dhug'mhar's revised estimate held for the rate. It did not hold for when the rate would stop being the relevant number."

"The boundary did not slow or speed up," Aliyah said. "It reached the arc, a fixed point, sooner than seven more days of the same rate would suggest, because the rate from eleven days ago was already an average."

She set the report down and reached for the morning's instrument log, the sixth Keystone's reading the first line on the page, as it had been for weeks.

The number was different.

Not the cycling variance the second Keystone showed, not the static line the sixth had held since Prenn's dedicated watch began. A higher number than yesterday's, by an amount that, on any other morning, would not have been the first thing she looked for.

Today it was the only thing she looked for.

She found Norrak at the sixth Keystone's station, Prenn beside him, both already looking at the same number.

"When did this start," she said.

"Sometime in the last six hours," Prenn said. "The midnight reading was at baseline. This one, at dawn, is not."

"Consistent rate, or a single step."

Norrak answered before Prenn did. "Consistent. I took two readings forty minutes apart, once I saw the dawn number was different, because Durahl told me that is what to do if something looks different."

"Both readings fit the same line. It is climbing at a steady rate, not in steps."

Aliyah looked at the two readings, then at the line Norrak had sketched beneath them, careful and a little uneven, the handwriting of someone still building the muscle for it.

The line matched the signature Durahl had taught everyone to recognize: consistent rate, not cycling. Advancing.

"The sixth Keystone has never done this," Darak said. He had followed her across the room. "Not once, since Prenn's watch began."

"It is doing it now." Aliyah looked at the timestamp on the dawn reading, then at the timestamp on the courier's report, written the previous evening at Yohan.

"The wall-mount engagement happened yesterday afternoon," she said slowly. "The sixth Keystone's advancement began sometime in the night that followed."

Darak understood what she was building toward before she finished saying it.

"The eastern front met something it had not met before, and lost ground there for the first time," he said. "Within hours, the Arch front, quiet for weeks, started moving for the first time."

"Two fronts," Aliyah said. "One intelligence. When one front becomes harder, it does not stop."

"It goes looking for where it is still easy."

She looked at the sixth Keystone's reading again, the steady climbing line, the first movement from a Keystone that had sat at the same number so long that Prenn's watch had started to feel, to everyone including Prenn, like a formality.

It had never been a formality. It had been waiting.

"Get Vor'gath," she said. "Now. And find Rakh'ash'tha."

"Whatever is coming, it is coming here, and it has been waiting for the one morning we would be looking somewhere else, which makes today exactly the wrong morning to be slow."

Vor'gath arrived within minutes, Rakh'ash'tha close behind him.

He went to the sixth Keystone's housing and placed his hands at its base, the way he had placed them at the third Keystone's base so many times the motion had become unconscious.

He was quiet for longer than usual.

"This is not the same," he said, when he opened his eyes. "The third Keystone's vulnerability is a single point, precise, the chisel-and-grain angle I have mapped over weeks. This is not a single point."

"What is it," Aliyah said.

"Broad, diffuse. Whatever is pressing here is not finding a weakness and exploiting it the way the patient entity does. It is simply pushing, everywhere at once, on a Keystone that has had no active defense for as long as it has existed."

"Can you disrupt it the way you disrupt the patient entity."

"I can try. I do not know what it will do."

"The three-second windows at the third Keystone work because I know exactly where the entity is and exactly what it is doing. Here, I know neither, and a description of that is not yet a plan."

Rakh'ash'tha was already moving to the housing's far side, the buffer position she had taken during reinforcement windows for weeks, a position that had never yet been needed for anything larger than a single small probe.

"The locus division technique," she said. "I divided load at the second Keystone once, during the emergency reinforcement, on a binding I did not understand either."

"I did it because Aliyah told me where to put my hands, and I trusted that she knew, even though I did not."

"I do not know where to tell you to put your hands this time," Aliyah said. "Not yet."

"Then I will put them where Vor'gath puts his, and we will both learn what this is while we try to slow it down."

Aliyah looked at the climbing line on Norrak's page, the rate steady, the number already higher than an hour ago.

"Then we start now," she said. "Norrak, Prenn, Durahl, Kessin."

"Readings every two minutes on this station, no exceptions. Someone watches the third and second the entire time."

The instrument room, which had spent weeks learning to hold two things at once, began holding three.