The Underbelly did not welcome visitors.
William remembered this place from his childhood—the narrow tunnels, the dripping ceilings, the smell of wet stone and old rot. He had been born here, in sub-level 4, in a room no larger than the Academy's supply closet. His first bed had been a pile of rags. His first toy had been a rusted dagger his father found in the sewage drains.
Three years at the Academy had softened him.
He realized this as he followed Julian down a spiral staircase that had not been maintained in decades. The steps were slick with something William did not want to identify. The walls were covered in black residue—Sword Rust, the locals called it. A byproduct of forbidden blade techniques. A mark of the Underbelly's true nature.
This was where the Wands sent what they could not control.
This was where the Swords had learned to survive.
Julian moved with surprising confidence for an heir to a founding bloodline. He did not hesitate at the branching tunnels. He did not flinch when rats scurried across his boots. He simply walked, his enchanted torch casting long shadows that seemed to move independently of the light.
"How do you know this place?" William asked. His voice echoed in the narrow passage. The sound was swallowed by the Rust.
"My mother brought me here once. Before she died." Julian's tone was flat. "She wanted me to see where the other half lived. She said it would make me a better leader."
"Did it?"
Julian did not answer.
They descended deeper. Sub-level 1 gave way to sub-level 2, then 3. The air grew thicker. Heavier. The Sword Rust on the walls became thicker too—not just residue now, but actual growths. Black crystals that jutted from the stone like jagged teeth.
William touched one. It was warm. Pulsing. Alive in some way that had nothing to do with magic.
"Don't touch that," Julian said without looking back.
"Why?"
"Because it's made of blood."
William pulled his hand away. He looked at his fingertips. They were clean. No stain. No residue. But the crystal had felt familiar. Like the sword. Like the hunger.
They emerged into a wider chamber. The ceiling was lost in darkness. The floor was littered with broken furniture, shattered mana-lances, and the bones of things William could not identify. In the center of the chamber, a fire burned—not magical fire, but real flames fed by scavenged wood and who-knew-what-else.
Beside the fire sat a man.
He was not a large man. In fact, he was smaller than William had expected. Gaunt. Hunched. His skin was the color of old paper, stretched tight over bones that seemed too sharp, too prominent. His left arm ended at the elbow. The stump was covered by a leather cap held in place with brass buckles.
His right arm was wrapped in bandages from wrist to shoulder.
His eyes were the color of rust.
"You brought a puppy," the man said. His voice was gravel and broken glass. "I don't train puppies."
Julian stepped aside, revealing William fully. "He's the Draven boy. The one I told you about."
The Hound's rust-colored eyes moved to William's face. They lingered there for a long moment. Then they dropped to William's right hand—the hand that still held the sword.
"You brought the blade too." The Hound's expression did not change. "Stupid. Very stupid."
"It wouldn't let go," William said.
"No. It wouldn't." The Hound rose from his seat. He was shorter than William by half a head, but the way he moved—the economy of motion, the coiled tension in his remaining arm—made him seem larger. More dangerous. "Give it to me."
William tried to open his fingers. They did not open. The sword's hilt was stuck to his palm as if glued there. As if fused.
The Hound walked closer. His bare feet made no sound on the stone floor. He stopped in front of William and extended his bandaged right hand.
"The blade knows me," he said. "It won't hurt me. Give it."
"I can't."
"You can. You're choosing not to."
William's jaw tightened. "I'm not—"
"Your father chose the same way." The Hound's voice softened, just slightly. "He held that blade for three days before he let it go. His hand bled for two of them. By the third, the blood had stopped flowing. The blade had accepted him. But it had also marked him."
William looked down at his hand. The skin around the hilt was red. Irritated. As if the sword was trying to burrow into him.
"Let go," The Hound said again.
This time, William tried differently. He did not fight the sword. He did not command his fingers to open. Instead, he acknowledged the hunger. He felt it—the blade's thirst, its need, its endless wanting. And then he set it aside.
Not suppressed. Not denied.
Set aside.
His fingers opened.
The sword did not fall. It hovered for a moment, suspended between William's palm and The Hound's waiting hand. Then it drifted slowly, almost reluctantly, into the older man's grip.
The Hound held the blade like an old friend. He turned it over in his bandaged hand, examining the edge, the hilt, the pommel. The firelight danced along the steel, revealing patterns in the metal—waves and whirlpools that seemed to move when William looked directly at them.
"Damascus steel," The Hound said. "Forged in the fires of the old empire, before the Wands came. Quenched in the blood of a thousand warriors. Folded ten thousand times." He looked at William. "Do you know what that makes it?"
"A sword."
"A graveyard." The Hound set the blade down on a cracked stone table. The metal seemed to sigh. "Every fold traps a memory. Every memory holds a death. This blade has killed more people than you will ever meet. And it remembers every single one."
William stared at the sword. It looked ordinary now. Just a piece of steel on a broken table. But he could still feel it. The hunger. The weight. The presence.
"Why did it kill Thomas?" he asked. "My roommate. He didn't do anything wrong."
The Hound sat back down by the fire. He gestured for William to sit across from him. Julian remained standing, his back to the wall, his eyes watchful.
"The blade doesn't need a reason," The Hound said. "It kills because that's what it was made for. The question isn't why it killed Thomas. The question is why it chose you."
"I don't know."
"Yes, you do." The Hound's rust-colored eyes bored into William's. "You've always known. You just haven't said it out loud."
William looked away. The fire crackled. The shadows danced. Somewhere in the distance, water dripped—slow, rhythmic, eternal.
"The Sword-Saint," William said quietly. "It's my ancestor."
"The first Sword-Saint," The Hound corrected. "The one who started the Rebellion. The one who almost tore down the Spire. The one who's been chained in sub-level 9 for fifty years, screaming into the dark." He leaned forward. "His blood runs in your veins. That's why the blade chose you. That's why you can hold it without dying. That's why the hunger feels like home."
William's stomach turned. He had suspected. His father had hinted. But hearing it spoken aloud—hearing that the monster in the depths was his own flesh and blood—made it real in a way he had not prepared for.
"I don't want to be like him," William said.
"Good." The Hound nodded. "Because he's insane. Centuries of imprisonment will do that to a man. He doesn't want freedom anymore. He wants revenge. And when he breaks free—not if, when—he will kill every Wand in Veridias City. Every man. Every woman. Every child."
"Then why are you helping me?"
"Because you're the only one who can stop him."
The words hung in the air. Julian shifted against the wall. Even he seemed surprised by this revelation.
"How?" William asked.
"By becoming something the world has never seen. A Sword who can walk among Wands. A killer who can show mercy. A weapon that chooses its own targets." The Hound pointed his bandaged arm at the blade on the table. "That sword is a key. It can open the locks on sub-level 9. It can also seal them again. But only if the wielder has the strength to command it."
William looked at the sword. Then at his own hands. The calluses were still there. The blood was gone, but the memory remained.
"How long?" he asked.
"To train you? Six months. Maybe less if you're as stubborn as your father." The Hound's lips twitched—the ghost of a smile. "But the Grand Conjunction is in four months. So we'll have to work faster."
"Four months?" Julian stepped forward. "That's not enough time. Even with your training—"
"It's enough," The Hound said. "Or it isn't. Either way, it's all we have." He looked at William. "The first lesson starts now. Stand up."
William stood.
"Good. Now take off your shirt."
William hesitated. The Hound's expression did not change. Julian raised an eyebrow but said nothing. Slowly, William pulled his blood-stained uniform tunic over his head.
The firelight revealed his torso. Pale skin. Ribs that were too visible. And scars. Dozens of scars. Old cuts, new bruises, burn marks that had healed badly. The map of a childhood spent in the Underbelly, learning to fight before he could read.
The Hound walked around William, studying the scars. He touched some of them with his bandaged fingers. He pressed on others. He nodded to himself, as if confirming something.
"Your father taught you the forms," The Hound said. "But he didn't teach you the price."
"What price?"
The Hound stopped in front of William. Without warning, he slapped William across the face.
The strike was not hard. It was precise. The bandages scraped across William's cheek, leaving a raw, stinging sensation. But the pain was not what made William freeze.
It was the sound.
The slap had echoed. In a chamber full of Sword Rust, in a place where sound was supposed to be swallowed, the slap had echoed.
"The Rust reacts to physical force," The Hound said. "Not magic. Not mana. Physical force. The harder you hit, the more it resonates. The more it resonates, the more it amplifies your attack." He gestured to the walls. "This entire sub-level is a weapon. Every crystal. Every patch of Rust. And you're going to learn how to use it."
William touched his cheek. The sting was fading, replaced by a warmth that spread through his jaw, his neck, his shoulder. The warmth felt like the sword's hunger. But different. Cleaner.
"The first lesson," The Hound continued, "is not how to swing a blade. You already know that. The first lesson is how to take a hit without breaking."
He slapped William again. Other cheek this time. Harder.
William did not flinch. He did not move. He kept his eyes on The Hound's rust-colored gaze.
"Good," The Hound said. "Again."
The third slap was harder than the second. William's head turned with the force of it, but he did not step back. His feet remained planted. His hands remained at his sides.
"Again."
The fourth slap drew blood. William tasted iron. He swallowed it.
"Again."
The fifth slap cracked something in his jaw. Not broken—just shifted. A tooth came loose. William spat it out.
"Again."
The sixth slap sent him to his knees.
The Hound stood over him. His bandaged hand was red now—not with his own blood, but with William's. He did not look satisfied. He did not look disappointed. He looked like a man who had done this many times before.
"Get up," he said.
William got up.
"Again."
The seventh slap did not come. Instead, The Hound stepped back. He picked up the sword from the table and tossed it to William.
The hilt landed in William's palm. His fingers closed around it automatically. The hunger surged—angry now, hungry, desperate to lash out. The blade wanted to cut The Hound's throat. It wanted to taste the old man's blood.
William held it still.
"Good," The Hound said. "You're angry. Use it."
"I don't want to hurt you."
"You won't." The Hound raised his bandaged arm. "Try."
William hesitated. Julian watched from the shadows, his blue eyes gleaming. The fire crackled. The Rust pulsed.
William swung.
The blade moved faster than he expected. Faster than it ever had before. The hunger guided his arm, corrected his angle, added force to his strike. The edge sliced toward The Hound's neck—
And stopped.
The Hound had caught the blade between his bandaged fingers.
Not the flat of the blade. Not the side. The edge. He was holding a weapon that could cut through steel with his bare hand, and his fingers were not bleeding.
"How—" William started.
"The Rust," The Hound said. "It's not just on the walls. It's in me. In every Sword who's spent enough time down here." He released the blade. His fingers were unmarked. "Your father had it too. By the end, he could catch arrows with his bare hands."
William stared at The Hound's fingers. Then at his own hand. Then at the blade.
"I don't have Rust in me," he said.
"Not yet." The Hound walked back to the fire and sat down. "But you will. Every time you use the sword, the Rust spreads. A little at first. Then more. Eventually, it will cover your entire body. And when it does—"
"I become like you."
"You become like the Sword-Saint." The Hound's voice was quiet. "The Rust doesn't just change your body. It changes your mind. It feeds on anger. On hatred. On the desire to kill. The more you use it, the more it consumes you."
William looked at the black crystals on the walls. They pulsed in time with his heartbeat. In time with the sword's hunger.
"There has to be another way."
"There is." The Hound pointed at Julian. "His mother was working on a cure. A way to use the Rust without being consumed by it. She died before she could finish her research."
Julian's expression hardened. "My mother's notes were destroyed. The Council saw to that."
"No." The Hound shook his head. "They burned her laboratory. They burned her home. But she was smarter than that. She hid the real research somewhere the Council would never think to look."
"Where?"
The Hound looked at William. "Inside the Academy. In the one place that's forbidden to all students."
Julian's eyes widened. "The Forbidden Archive."
"The Blind Enchantress has your mother's notes, Cross. She's been keeping them for fifteen years. Waiting for someone to come and claim them." The Hound leaned back. "But she doesn't give anything away for free. She trades. Memory for memory. Secret for secret."
William felt a chill that had nothing to do with the cold. Trading memories meant losing them. Forever. Erasing parts of himself.
Just like the Council erased Unpersons.
"What kind of memory would she want?" William asked.
"Something precious. Something you can't live without." The Hound's rust-colored eyes met William's. "Your first memory of your mother. Your father's last words. The face of the first person you ever loved." He shrugged. "She's not picky. She just wants to feel something again. She's been blind for so long, she's forgotten what color looks like."
William thought of his mother's face. The sound of her singing. The way she smelled—like old books and the oil his father used on his blades.
He would not trade those memories. Not for anything.
"There has to be another way," he said again.
"There's always another way," The Hound said. "But it's harder. Slower. More painful." He stood up. "The second lesson starts now. Follow me."
The Hound walked toward a tunnel on the far side of the chamber. The darkness swallowed him almost immediately. William looked at Julian.
"Are you coming?" he asked.
Julian shook his head. "This part is for you. I'll wait here."
William turned and followed The Hound into the dark.
The tunnel was narrow. The walls were close enough to touch on both sides. The Rust was thicker here—not just crystals, but actual sheets of black material that covered the stone like a second skin. The air was warm. Humid. It tasted of iron and old sweat.
William walked for what felt like hours. The tunnel sloped downward, then leveled out, then sloped again. The darkness was complete except for the faint glow of the Rust—a phosphorescent light that seemed to come from nowhere and everywhere at once.
Ahead, he saw a flicker of orange. Fire.
He emerged into a smaller chamber. This one was round, maybe twenty feet across, with a ceiling that arched overhead like a ribcage. The walls were lined with weapons. Swords. Daggers. Axes. Spears. Some were ancient—rusted, pitted, barely recognizable. Others were brand new, their edges gleaming in the firelight.
In the center of the chamber stood a training dummy. Not the padded kind used at the Academy. This one was made of iron. Bolted to the floor. Covered in dents and scratches and dark stains that might have been blood.
"This is where your father trained," The Hound said. "This is where I trained. This is where every Sword in the Rebellion learned to fight." He picked up a sword from the wall and tossed it to William. "The blade you brought is too dangerous to train with. You'll use this one instead."
William caught the new sword. It was heavier than his blade. Cruder. The balance was wrong, the edge was dull, and the hilt was wrapped in fraying leather. But it felt good in his hand. Solid. Honest.
"Hit the dummy," The Hound said.
William swung. The blade struck the iron dummy with a loud clang. The impact vibrated up his arm, through his shoulder, into his teeth. He nearly dropped the sword.
"Again."
He swung again. Clang. The vibration was worse this time. His hand went numb.
"Again."
Clang. The sword slipped. William caught it with his other hand and swung again. Clang. Clang. Clang.
"Faster."
William increased his speed. The strikes came faster, harder, wilder. Sweat dripped into his eyes. His arms burned. His shoulders screamed. But he did not stop. He could not stop. The sword wanted to keep going, and for once, William agreed with it.
"Good," The Hound said. "Now hit it like you mean it."
William roared. He brought the sword down with every ounce of strength he had left. The blade struck the iron dummy's head—
And sheared through.
The iron head flew across the chamber and clanged against the wall. The dummy's neck was a clean cut, smooth as glass. William stared at the severed metal. He had not been strong enough to do that. He knew he hadn't.
The Rust on the walls pulsed. Bright. Hungry.
The sword in William's hands was warm. Not from friction. From something else. Something that had flowed from the walls, through his body, into the blade.
"Congratulations," The Hound said. "You just used the Rust for the first time. It only gets worse from here."
William dropped the sword. It clattered on the stone floor. His hands were shaking. His heart was pounding. His mind was racing.
But beneath the fear, beneath the exhaustion, beneath the pain—
He felt powerful.
And that terrified him more than anything else.