The wards caught first.
Every green-gold line etched into Rennick's cellar walls flared at once. The open vial in his hand answered them light reaching for light, the way a held breath reaches for air.
Ethan felt his own coal lurch toward it, hungry and furious in the same instant.
For the first time, he understood viscerally that Alistair's warnings hadn't been caution.
They'd been mercy.
"Close the door," Alistair snapped not at Rennick.
At Ethan.
Ethan didn't have time to ask which door. He reached inward instead, the way Idris had taught him, and found the coal straining toward Rennick's vial like a starving thing toward bread.
His instinct was to yank it back.
Instead, he did something he hadn't tried before.
He held it.
Steadied it.
Stood with it instead of against it, the way you'd brace a door rather than slam it shut.
The coal stopped straining.
It didn't quiet. It turned instead toward him, almost startled, as if noticing for the first time that the boy carrying it had stopped fighting long enough to actually stand beside it.
Something in Ethan's chest clicked into place like a key finding its lock.
He didn't have a name for what happened next.
Later, Idris would give it one. He would write it down in his too-neat handwriting with something close to reverence.
But in that moment, it was only heat.
Controlled heat.
It rose through Ethan's arm and gathered in his open palm before erupting as a lance of green-gold light.
It struck the vial dead center.
The glass shattered.
Rennick staggered backward with a shout that was more surprise than pain. For a moment, the cellar filled with the smell of scorched glass and something underneath it coppery, faintly rotten gone almost as quickly as it came.
"That," he said, staring at his empty, singed hand, "is not supposed to be possible."
"A lot of things about tonight weren't supposed to be possible."
Alistair was already moving, already placing himself between Rennick and the stairs.
"Ethan. How do you feel?"
"Like I just held a door shut with my bare hands."
It was as close to the truth as Ethan could manage.
The coal in his chest had gone quiet.
For the first time, that silence didn't feel like a cage.
It felt like a partnership wary, unfinished, but real.
Some small, cold part of Ethan was already turning over what he'd learned about his own power.
He hadn't fought it.
He'd braced it.
That was worth remembering.
Rennick started laughing.
Low. Unbothered.
Even with his hand blistered and his prize destroyed, he somehow looked more amused than angry.
"You think this stops anything?"
He straightened, his coat torn but his dignity somehow intact.
"I'm not the only one harvesting. I'm not even the interesting one."
His gaze settled on Ethan.
"There are older things than your little green door taking an interest in this city this country and the world at large, boy. Things that were here before the Aether ever thought to bleed through."
His smile thinned.
"And they are not nearly so patient as I am."
"What things?" Idris asked sharply.
Rennick smiled.
But this time there was something underneath it that Ethan hadn't seen before.
Not confidence.
Fear.
Carefully worn like a mask over something worse.
"Ask your Cartographer," he said, "why half his ink is red instead of gold."
Marguerite had him restrained before he finished the sentence, but the words remained in the room long after.
Heavy as stone.
They didn't get anything else out of him that night.
The moment the Vigil's proper interrogators arrived, Rennick went quiet.
And quiet he stayed.
Alistair found that more unsettling than any amount of taunting would have been.
Hours later, back in the Vault, Idris pulled Ethan toward a section of his wall map he'd never paid much attention to deep in one corner, half-obscured by shelving.
The ink there wasn't green-gold.
It was the color of dried blood.
"I always assumed this was old work," Idris admitted, his voice quieter than usual. "Something I'd inherited from the Cartographer before me and never finished translating."
He paused.
"I never considered it might still be alive."
"What is it?" Ethan asked.
"Something from below, rather than beyond," Idris said.
He touched the red ink.
It seemed, faintly, to warm beneath his fingers.
"If the Aether bleeds in through doors, this" He paused, searching for the right words. "This rises. Has always risen. We simply never had a reason to look down instead of out."
Alistair, arms crossed, stared at the red ink for a long moment.
"Two fronts," he said finally.
He sighed.
"Wonderful. And here I thought tonight's excitement was going to be the hard part."
Ethan pressed a hand to his chest.
The coal was still there.
Still strange.
Still something he didn't fully understand.
But for one brief moment tonight, it had felt less like an enemy and more like something he might actually learn to carry properly.
He looked at the red ink.
Whatever came from below was going to want to know exactly what he'd become.
Ethan just hoped he'd have an answer ready before it asked.