“Lad…”

“You told me I had to do this, Teft,” Kaladin said. “You can storming let me get to it.”

Teft fell in behind him as Kaladin went and did his duty. He let them see him stand tall, let them be reassured he was still the brilliant leader they all knew. He had Laran summon her new Blade for him, and he congratulated her spren. They had few enough honorspren that he tried to always acknowledge them.

Afterward, as he’d hoped, Dalinar requested Windrunners to fly him, Navani, and a few of the others to the Shattered Plains. Many of the Radiants would stay behind to guard the Fourth Bridge as it made its longer voyage, but the command staff was needed for other duties.

After seeing to his parents—who of course decided to stay with the townspeople—Kaladin took off. At least with the wind rushing around them during flight, Teft couldn’t ask any more questions.

* * *

Navani both loved and detested contradictions.

On one hand, contradictions in nature or science were testaments to the logical, reasonable order of all things. When a hundred items indicated a pattern, then one broke that pattern, it showcased how remarkable the pattern was in the first place. Deviation highlighted natural variety.

On the other hand, that deviant stood out. Like a fraction on a page of integers. A seven within a sequence of otherwise sublime multiples of two. Contradictions whispered that her knowledge was incomplete.

Or—worse—that maybe there was no sequence. Maybe everything was random chaos, and she pretended the world made sense for her own peace of mind.

Navani flipped through her notes. Her featureless round chamber was too small to stand up in. It had a table—bolted to the floor—and a single chair. She could touch the walls to both sides simultaneously by stretching out her arms.

A goblet to hold spheres was affixed to the table and fastened shut at the top. She’d brought only diamonds for light, naturally. She couldn’t stand when her light was made up of a hundred different colors and sizes of gems.

She stretched her legs forward under the table, sighing. Hours spent in this room made her long to get up and go for a walk. That wasn’t a possibility, so instead she laid out the offending pages on her desk.

Jasnah enjoyed finding inconsistencies in data. Navani’s daughter seemed to thrive on contradictions, little deviations in witness testimony, questions raised by a historical account’s biased recollections. Jasnah picked carefully at such threads, pulling at them to discover new insights and secrets.

Jasnah loved secrets. Navani was more wary of them. Secrets had turned Gavilar into … whatever it was he’d been at the end. Even today, the greed of artifabrians across the world prevented the greater society from learning, growing, and creating—all in the name of preserving trade secrets.

How many secrets had the ancient Radiants preserved for centuries, only to lose them in death—forcing Navani to have to discover everything anew? She reached down beside her chair and picked up the fabrial Kaladin and Lift had discovered.

She had no idea what to make of the thing. A collection of four garnets? No spren appeared to be trapped in any of them. She didn’t recognize the metal of its cage, the cut of its gemstones.… Studying the thing was like trying to understand a foreign language. How had it suppressed the Radiants’ abilities? Was this related to the gemstones embedded in the weapons of the enemy soldiers, the ones that drained away Stormlight? So many storming secrets.

She held up a sketch of the gemstone pillar at the heart of Urithiru. It is the same, she thought, turning the fabrial in her hand, then comparing it to a similar-looking construction of garnets in the picture. The ones in the pillar were enormous, but the cut, the arrangement of stones, the feel was the same.

Why would the tower have a device to suppress the powers of Radiants? It was their home.

Could it be the opposite? she thought, putting down the alien fabrial and making a note in the margins of the drawing. A way to suppress the abilities of the Fused?

So much about the tower still didn’t make any sense. She had a Bondsmith in Dalinar. Shouldn’t he and the Stormfather be able to mimic whatever the long-dead tower spren had done to power the pillar and the tower?

She held up a second picture, this one of a more familiar device—a construction of three gemstones connected by chains, meant to be worn on the back of the hand. A Soulcaster.

Soulcasters had long bothered Navani. They were the proverbial flaw in the system, the fabrial that didn’t make sense. Navani wasn’t a scholar herself, but she had a strong working knowledge of fabrials. They produced certain effects, mostly amplifying, locating, or attracting specific elements or emotions—always tied to the type of spren trapped inside. The effects were so logical that theoretical fabrials had been correctly predicted years before their successful construction.

A technological masterpiece like the Fourth Bridge was no more than a collection of smaller, simpler devices intertwined. Pair one set of gemstones, and you had a spanreed. Interwork hundreds, and you could make a ship fly. Assuming you’d discovered how to isolate planes of motion and reapply force vectors through conjoined fabrials. But even these discoveries had been more small tweaks than revolutionary changes.

Each step built on the previous ones in logical ways. It made perfect sense, once you understood the fundamentals. But Soulcasters … they broke all the rules. For centuries, everyone had explained them as holy objects. Created by the Almighty and granted to men in an act of charity. They weren’t supposed to make sense, because they weren’t technological, but divine.

But was that really true? Or could she, with study, eventually discover their secrets? For years, they’d assumed no spren were trapped in Soulcasting devices. But with the Oathgates, Navani could travel into Shadesmar—and everything in the Physical Realm reflected there. Human beings manifested as floating candle flames. Spren manifested as larger, or more complete versions of what was seen in the Physical Realm.

Soulcasters manifested as small unresponsive spren, hovering with their eyes closed. So the Soulcasters did have a captured spren. A Radiant spren, judging by their shape. Intelligent, rather than the more animal-like spren captured to power normal fabrials.

These spren were held captive in Shadesmar, and made to power Soulcasters. Is this the same, perhaps? Navani thought, holding up the gemstone device Kaladin had discovered. There had to be a connection. And perhaps a connection to the tower? The secret to making it function?

Navani shuffled through pages in her notebook, looking at the multitude of schematics she’d drawn during the last year. She’d been able to piece together many of the tower’s mechanics. Though they were—like Soulcasters—created by somehow trapping spren in Shadesmar. Their functions, however, were similar to the ones designed by modern artifabrians.

The moving lifts? A combination of conjoined fabrials and a hidden waterwheel that dipped into an underground river, which flowed from melting snow in the peaks. The city’s wells constantly replenished with fresh water? A clever manipulation of attractor fabrials, powered by ancient gemstones exposed to the air and the storms far beneath the tower.

Indeed, the more she studied Urithiru, the more she saw the ancients using simple fabrial technology to create their marvels. Modern artifabrians had exceeded such constructs; her engineers had repaired, refitted, and streamlined the lifts, making them function at several times their original speed. They’d enhanced the wells and pipes, which could now draw water farther up the tower into long-abandoned waterways.