Kylan pressed his palms against the cold stone floor, breathing hard. The runes beneath his fingers still hummed with residual energy, a faint blue glow that flickered like a dying heartbeat. He had only meant to practice the basic summoning sigil—a simple exercise his master had assigned him three days ago. But somewhere between the third and fourth line of the inscription, his hand had slipped, and the chalk had drawn itself into a pattern he had never seen before.

The air in the underground chamber tasted different now. Heavier. Charged with something that made the hairs on his arms stand straight up.

“Kylan?” His master’s voice echoed down the stone stairway. “What was that light? I’m coming down.”

He didn’t have much time. The chamber was deep beneath the old tower, a place where apprentices practiced when they weren’t ready for the upper classrooms. Kylan scrambled to his feet, grabbing his chalk, and tried to smear the circles with the heel of his palm. The blue light flickered stronger, as if mocking his effort.

From the corner of the chamber, where the shadows pooled deepest, something moved.

It was not a creature he recognized. It looked like smoke given form—dark, shifting, with edges that seemed to tear at the air around it. It stood roughly as tall as a man, though it had no true shape, and when it “looked” at him, Kylan felt the gaze like ice water sliding down his spine.

“You called,” it said. Its voice was like wind through a cracked door. “You may not have meant to. But you did.”

“I didn’t—I was just—” Kylan’s voice came out thin and broken. He took a step backward, his heel catching on a loose stone. “Please, I didn’t know what I was drawing.”

The thing drifted closer. “The circle you drew was in my master’s ledger three hundred years ago. He sealed me beneath this tower after I refused to serve his grandson. Your chalk broke the ward.”

Kylan felt the blood drain from his face. Three hundred years. The tower had been built four centuries past, and the sealing chamber beneath it had been declared empty by every mage who had ever studied here.

“What do you want?” Kylan asked.

“You owe me a debt. You broke the ward. In the old laws, that means you are bound to answer my question. One question, honestly given, and then I am free.”

But there was no way out. He had drawn the circle. The debt was real.

“Ask your question,” he said.

The entity drifted closer, and then—impossibly—it condensed into the shape of a man. Tall and gaunt, with skin the color of old parchment and eyes that held the deep amber of candlelight.

“My question is this,” the man said. “The village of Thornwick, three miles north of this tower—is it still standing?”

Kylan blinked. “Thornwick? It’s still there. Small, but the market runs every third day and the inn has good bread.”

The man went still. “Three hundred years. And Thornwick still stands. My name is Aldric. I was the last mage of the Thornwick school before the sealing. Your chalk broke the ward that held me prisoner.”

Kylan felt the weight of the moment settle onto his shoulders like a physical thing. He had not expected his simple mistake to free a centuries-old mage from imprisonment.

“What will you do now?” Kylan asked.

“That depends on you,” Aldric said. “I could return to Thornwick, or I could stay here and complete what I started three centuries ago. My research is still in this tower—notes that could change the nature of summoning magic entirely.”

“Teach me,” Kylan said. “I broke your ward by accident, and in doing so I learned that everything I thought I knew about summoning circles might be incomplete.”

Aldric studied him for a long moment. Then, slowly, he smiled. “You will need to explain this to your master. But once he sees my notes, he won’t be able to argue with the results.”

The sound of footsteps on the stairs above made them both look up. Kylan’s master was getting closer, and he had no idea what he was about to find. But for the first time since he had drawn that accidental circle, Kylan felt something other than fear. He felt like he might have accidentally stumbled onto the most important discovery of his life.