Jun paced to the front of the courtyard, satisfied that they were standing as uncomfortably as possible. He stopped in front of Nezha. “What happened to your face?”

Nezha had developed a truly spectacular bruise over his left eye, a bright splotch of violet on his otherwise flawless mien.

“Got in a fight,” Nezha mumbled.

“When?”

“Last night.”

“You’re lucky,” Jun said. “If it had been any later, I would have expelled you.”

He raised his voice to address the class. “The first and most important rule of my class is this: do not fight irresponsibly. The techniques you are learning are lethal in application. If improperly performed, they will cause serious injury to yourself or your training partner. If you fight irresponsibly, I will suspend you from my class and lobby to have you expelled from Sinegard. Am I understood?”

“Yes, sir,” they answered.

Nezha twisted his head over his shoulder and shot Rin a look of pure venom. She pretended not to see.

“Who’s had martial arts training before?” Jun asked. “Show of hands.”

Nearly the entire class raised their arms. Rin glanced around the courtyard, feeling a swell of panic. Had so many of them trained before the Academy? Where had they trained? How far ahead of her were they? What if she couldn’t keep up?

Jun pointed to Venka. “How many years?”

“Twelve,” said Venka. “I trained in the Gentle Fist style.”

Rin’s eyes widened. That meant Venka had been training almost since she could walk.

Jun pointed to a wooden dummy. “Backward crescent kick. Take the head off.”

Take the head off? Rin looked doubtfully at the dummy. Its head and torso had been carved from the same piece of wood. The head hadn’t been screwed on; it was solidly connected to the torso.

Venka, however, seemed entirely unperturbed. She positioned her feet, squinted at the dummy, and then whipped her back leg around in a twist that brought her foot high up over her head. Her heel cut through the air in a lovely, precise arc.

Her foot connected with the dummy’s head and lobbed it off, sent it flying clean across the courtyard. The head clattered against the corner wall and rolled to one side.

Rin’s jaw fell open.

Jun nodded curtly in approval and dismissed Venka. She returned to her place in the ranks, looking pleased.

“How did she do that?” Jun asked.

Magic, Rin thought.

Jun stopped in front of Niang. “You. You look bewildered. How do you think she did that?”

Niang blinked nervously. “Ki?”

“What is ki?”

Niang blushed. “Um. Inner energy. Spiritual energy?”

“Spiritual energy,” Master Jun repeated. He snorted. “Village nonsense. Those who elevate ki to the level of mystery or the supernatural do a great disservice to martial arts. Ki is nothing but plain energy. The same energy that flows through your lungs and blood vessels. The same energy that moves rivers downstream and causes the wind to blow.”

He pointed up to the bell tower on the fifth tier. “Two servicemen installed a newly smelted bell last year. Alone, they never would have lifted the bell all that distance. But with cleverly placed ropes, two men of average build managed to lift something many times their weight.

“The principle works in reverse for martial arts. You have a limited quantity of energy in your body. No amount of training will allow you to accomplish superhuman feats. But given the right discipline, knowing where to strike and when . . .” Jun slammed his fist out at the dummy’s torso. It splintered, forming a perfect radius of cracks around his hand.

He pulled his arm away. The dummy torso shattered into pieces that clattered to the ground. “You can do what average humans think impossible. Martial arts is about action and reaction. Angles and trigonometry. The right amount of force applied at the proper vector. Your muscles contract and exert force, and that force is dispelled through to the target. If you build muscle mass, you can exert greater force. If you practice good technique, your force disperses with greater concentration and higher effectiveness. Martial arts is no more complicated than pure physics. If that confuses you, then simply take the advice of the grand masters. Don’t ask questions. Just obey.”

History was a lesson in humility. Stooped, balding Master Yim began expounding on Nikan’s military embarrassments before they had even finished filing into the classroom.

“In the last century, the Empire has fought five wars,” Yim said. “And we’ve lost every single one of them. This is why we call this past century the Age of Humiliation.”

“Upbeat,” muttered a wiry-haired kid in the front.

If Yim heard him, he didn’t acknowledge it. He pointed to a large parchment map of the eastern hemisphere. “This country used to span half the continent under the Red Emperor. The Old Nikara Empire was the birthplace of modern civilization. The center of the world. All inventions originated from Old Nikan; among them the lodestone, the parchment press, and the blast furnace. Nikara delegates brought culture and methods of good governance to the islands of Mugen in the east and to Speer in the south.

“But empires fall. The old empire fell victim to its own splendor. Flush with victories of expansion in the north, the Warlords began fighting among themselves. The Red Emperor’s death set off a series of succession battles with no clear resolution. And so Nikan split into the Twelve Provinces, each headed by one Warlord. For most of recent history, the Warlords have been preoccupied with fighting each other. Until—”

“The Poppy Wars,” said the wiry-haired kid.

“Yes. The Poppy Wars.” Yim pointed to a country on Nikan’s border, a tiny island shaped like a longbow. “Without warning, Nikan’s little brother to the east, its old tributary nation, turned its dagger on the very country that had given it civilization. The rest you know, surely.”

Niang raised her hand. “Why did relations sour between Nikan and Mugen? The Federation was a peaceful tributary in the days of the Red Emperor. What happened? What did they want from us?”

“Relations were never peaceful,” Yim corrected. “And are not to this day. Mugen has always wanted more, even when it was a tributary. The Federation is an ambitious, rapidly growing country with a bulging population on a tiny island. Imagine you’re a highly militaristic country with more people than your land can sustain, and nowhere to expand. Imagine that your rulers have propagated an ideology that they are gods, and that you have a divine right to extend your empire across the eastern hemisphere. Suddenly the sprawling landmass right across the Nariin Sea looks like a prime target, doesn’t it?”

He turned back to the map. “The First Poppy War was a disaster. The fractured Empire could never stand up against well-trained Federation troops, who had been drilling for decades for this enterprise. So here’s a puzzle for you. How did we win the Second Poppy War?”

A boy named Han raised his hand. “The Trifecta?”

Muted snickers sounded around the classroom. The Trifecta—the Vipress, the Dragon Emperor, and the Gatekeeper—were three heroic soldiers who had unified the Empire against the Federation. They were real—the woman known as the Vipress still sat on the throne at Sinegard—but their legendary martial arts abilities were the subject of children’s tales. Rin had grown up hearing stories about how the Trifecta had single-handedly flattened entire Federation battalions, leveraging storms and floods with their supernatural powers. But even she thought it sounded ridiculous in a lecture about history.