He took a bite of his mush. “Go into the other room.”

“What?”

“Just do it. Take your writing board.”

She sighed, standing up, joints popping. Was she getting that old? Starlight, but they’d spent a long time out on this island. She walked to the other room, where their cot was.

“What now?” she called.

“I’m going to measure the spren with your calipers,” he called back. “I’ll take three measurements in a row. Only write down one of the figures I give you. Don’t tell me which one you’re writing down.”

“All right,” she called back. The window was open, and she looked out over a darkening, glassy expanse of water. The Reshi Sea wasn’t as shallow as the Purelake, but it was quite warm most of the time, dotted with tropical islands and the occasional monster of a greatshell.

“Three inches, seven tenths,” Ashir called.

She didn’t write down the figure.

“Two inches, eight tenths.”

She ignored the number this time too, but got her chalk ready to write—as quietly as possible—the next numbers he called out.

“Two inches, three ten—Wow.”

“What?” she called.

“It stopped changing sizes. I assume you wrote down that third number?”

She frowned, walking back into their small living chamber. Ashir’s hotplate sat on a low table to her right. After the Reshi style, there were no chairs, just cushions, and all the furniture was flat and long, rather than tall.

She approached the hearth. One of the two flamespren danced about atop a log, shape changing and length flickering like the flames themselves. The other had taken on a far more stable shape. Its length no longer changed, though its form did slightly.

It seemed locked somehow. It almost looked like a little person as it danced over the fire. She reached up and erased her notation. It immediately began pulsing and changing erratically like the other one.

“Wow,” Ashir repeated. “It’s as if it knows, somehow, that it has been measured. As if merely defining its form traps it somehow. Write down a number.”

“What number?”

“Any number,” he said. “But one that might be the size of a flamespren.”

She did so. Nothing happened.

“You have to actually measure it,” he said, tapping his spoon softly against the side of his bowl. “No pretending.”

“I wonder at the precision of the instrument,” she said. “If I use one that is less precise, will that give the spren more flexibility? Or is there a threshold, an accuracy beyond which it finds itself bound?” She sat down, feeling daunted. “I need to research this more. Try it for luminosity, then compare that to my general equation of flamespren luminosity as compared to the fire they’re drawn to dance around.”

Ashir grimaced. “That, my dear, sounds a lot like math.”

“Indeed.”

“Then I shall make you a snack to occupy you while you create new marvels of calculation and genius.” He smiled, kissing her forehead. “You just found something wonderful,” he said more softly. “I don’t know what it means yet, but it might very well change everything we understand about spren. And maybe even about fabrials.”

She smiled, turning back to her equations. And for once, she didn’t mind at all as he began chatting about his ingredients, working out a new formula for some sugary confection he was sure she’d love.

Szeth-son-son-Vallano, Truthless of Shinovar, spun between the two guards as their eyes burned out. They slumped quietly to the floor.

With three quick strokes, he slashed his Shardblade through the hinges and latch of the grand door. Then he took a deep breath, absorbing the Stormlight from a pouch of gemstones at his waist. He burst alight with renewed power and kicked the door with the force of a Light-enhanced foot.

It flew backward into the room, hinges no longer holding it in place, then crashed to the floor, skidding on the stone. The large feast hall inside was filled with people, crackling hearths, and clattering plates. The heavy door slid to a halt, and the room grew quiet.

I am sorry, he thought. Then he dashed in to start the slaughter.

Chaos ensued. Screams, yells, panic. Szeth leaped atop the nearest dining table and started spinning, cutting down everyone nearby. As he did so, he made certain to listen to the sounds of the dying. He did not shut his ears to the screams. He did not ignore the wails of pain. He paid attention to each and every one.

And hated himself.

He moved forward, leaping from table to table, wielding his Shardblade, a god of burning Stormlight and death.

“Armsmen!” yelled the lighteyed man at the edge of the room. “Where are my armsmen!” Thick of waist and shoulder, the man had a square brown beard and a prominent nose. King Hanavanar of Jah Keved. Not a Shardbearer, though some rumors said that he secretly kept a Shardblade.

Near Szeth, men and women scrambled away, stumbling over one another. He dropped among them, his white clothing rippling. He cut through a man who was drawing his sword–but also sliced through three women who wanted only to escape. Eyes burned and bodies collapsed.

Szeth reached behind himself, infusing the table he’d leaped from, then Lashing it to the far wall with a Basic Lashing, the type that changed which direction was down. The large wooden table fell to the side, tumbling into people, causing more screams and more pain.

Szeth found himself crying. His orders were simple. Kill. Kill as you have never killed before. Lay the innocent screaming at your feet and make the lighteyes weep. Do so wearing white, so all know who you are. Szeth did not object. It was not his place. He was Truthless.

And he did as his masters demanded.

Three lighteyed men got up the nerve to attack him, and Szeth raised his Shardblade in salute. They screamed battle cries as they charged. He was silent. A flick of his wrist cut the blade from the first one’s sword. The length of metal spun in the air as Szeth stepped between the other two, his Blade swishing through their necks. They dropped in tandem, eyes shriveling. Szeth struck the first man from behind, ramming the Blade through his back and out his chest.

The man dropped forward–a hole in his shirt, but his skin unmarred. As he hit the floor, his severed sword blade clanged to the stones beside him.

Another group came at Szeth from the side, and he drew Stormlight into his hand and flung it in a Full Lashing across the floor at their feet. This was the Lashing that bonded objects; when the men crossed it, their shoes stuck to the floor. They tripped, and found their hands and bodies Lashed to the floor as well. Szeth stepped through them mournfully, striking.

The king edged away, as if to round the chamber and escape. Szeth sprayed a table’s top with a Full Lashing, then infused the entire thing with a Basic Lashing as well, pointed at the doorway. The table flipped into the air and crashed against the exit–the side bearing the Full Lashing sticking it to the wall. People tried to pry it out of the way, but that only made them bunch up as Szeth waded into them, Shardblade sweeping.

So many deaths. Why? What purpose did it fulfill?

When he’d assaulted Alethkar six years before, he’d thought that had been a massacre. He hadn’t known what a true massacre was. He reached the door and found himself standing over the bodies of some thirty people, his emotions caught up in the tempest of Stormlight within him. He hated that Stormlight, suddenly, as much as he hated himself. As much as the cursed Blade he held.