Chapter 69: The Hearthline

The room breathed warmth.

That was the best explanation Arthur could come up with.

The room radiated a gentle heat that rose through the stone beneath his feet, pressed gently against the back of his hands, and settled across his shoulders like a coat he hadn’t put on. It was far from the directional heat of a hearth that scorched your shins while your back stayed cold. The stone felt warm from within, warm the same way something living was.

This feels like modern heating… but that raises many questions: Why doesn’t the hearth’s fire radiate any heat? How is something like this even possible? Is it something material related or another use of magic?

Glyph sat now in the center of the rug with the posture of a senior official conducting an unscheduled review. His dark eyes swept the walls in slow, methodical arcs, while Lyra stood at the far wall with her palm flat against the stone, her head tilted at the angle of someone listening rather than touching. She had been there long enough that Arthur stopped expecting her to move. The runes at her collar glowed faintly as her robes shifted.

On the other hand, Sylvia sat at the table with a cooling cup of tea before her, watching her old colleague with the patience of someone who had learned, across many years, that waiting was simply part of the process.

“This section held best,” Lyra said, then she turned. “The northern face. The stone here took the inscription cleanly. Every node landed where I told it to.” She crossed the room with even steps, crouched, and pressed her palm against the floor. Glyph turned his head and regarded her solemnly.

“Hm.”

She rose and looked at Arthur. “You felt it when you came in. Don’t pretend you didn’t.”

“It’s warmer here than the corridor,” Arthur said carefully.

“Exactly!” She moved to the table, pulled out the chair beside Glyph, and sat. From somewhere inside her robe, she produced something that looked like a slender stylus. It was made from a material Arthur didn’t recognize, something between the texture of wood and the hardness of metal, the kind that seemed to absorb light rather than reflect it; thin as a quill but rigid. Lyra turned it between two fingers without appearing to notice she was doing so. “Tell me, Oliver. Do you know what a rune is?”

“I know they exist. Back in Ashford, we had a circular platform in the courtyard with inscriptions on it,” Arthur said.

“Good answer.” she set the stylus on the table, then immediately picked it up again. “A rune is a chain. You begin at one node, you inscribe to the next, then the next, and you close the circuit at the end. The mana follows the chain. It has no choice as the nodes tell it where to go and what to become along the way.” She tapped the stylus against her palm twice. “Like water through a canal. Cut the canal in the right shape and the water does exactly what you want.” She paused. “The canal takes a great deal of convincing, though. Some materials cooperate. Others argue.”

“You mentioned nodes,” Arthur said. “Are they similar to the ones inside an Elementalist body?”

“Hm.” Lyra tilted her head, then said, “That’s… not a bad comparison. In principle, they are similar. Natural nodes inside a mage shape mana and affirm its affinity before a spell forms. Rune nodes do the same thing; just outside the body.”

Interesting, I should learn whatever I can from this encounter.

Arthur nodded once, then said, “How many types of nodes are there?”

Lyra clasped her hands together, and her eyes brightened. “I like this curiosity of yours,” Lyra said. “There are six types of nodes, and one for each elemental affinity. Friction nodes for fire, condensation for water, density for earth, resonance for wind, lumen for light, and lastly abyssal for dark.” She paused, as if a thought crossed her mind, then continued like nothing happened, “Combine them in different chains, and you get different effects. That’s the essence of runecraft.”

“And the runes themselves?”

“Six primary families,” she replied. ”Ignis, Seryn, Aeron, Terran, Luxen, and Noxar.” She paused for a moment then added with a satisfied smile. “A circuit is simply a structured combination of them. And elementalists channel mostly one affinity while a runecrafter borrows whichever is needed.”

“Doesn’t that just make rune masters overpowered?” Arthur asked.

“That is a good question.” Lyra said. “And the answer is no. We inscribe runes with our mana instead of casting. A process that takes time, precision, preparation, and some tools.” She lifted the stylus slightly. “This acts as a medium, and without it, most runecrafters wouldn’t be able to shape their mana into stable nodes at all.”

For a moment, Arthur stood motionless, sorting through the rush of details.

“I see,” he said finally. “What is inscribed here, in this room?”

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Lyra looked at the wall the way someone looked at a letter they had written and half-forgotten about it. “A heating circuit. Nodes for intake, nodes for retention, and nodes for release.” She stood, crossed to the wall, and this time ran a fingertip along a section of the stone near the baseboard, as though tracing something invisible. “Laid through the whole thickness of it. The mana follows the chain, and the stone holds the warmth instead of letting it escape.” She stopped, then pointed at the pug on the rug. “He found the intake nodes before I could show him.”

Glyph, on the other hand, looked completely unbothered with whatever was happening.

“He always does,” she added.

So, the nodes guide the mana… and dictate the output. Which means the source is elsewhere.

“Where does the warmth come from originally?” Arthur asked.

“The mountain.” Sylvia answered that one.

She rose, walked to the window, and looked down at the training ring.

“Deep enough into the rock, there is a mana well, and we draw from that,” she said. “This room was the trial. We wanted to know if the circuit would hold through the cold and the sustained use across the winter.” A pause. “And so far, it held.”