I told him at sunrise.
Not because I was ready, but because the truth had become a physical weight, a jagged stone I'd been turning over in my palms all night.
I had spent the hours between midnight and dawn with my mother's journal splayed across my lap, reading and re-reading those four underlined words until they were scorched into my retinas.
And by the time the sky outside the north wing shifted from an abyssal black to that bruised, skeletal grey of a winter morning, I realized that keeping this secret was the most dangerous thing I could do.
A key is a tool. And a tool implies an architect.
I knocked on the connecting door with the heavy, insistent thud of a herald.
He answered instantly. He was already dressed, his boots buckled and his dark tunic straightened, suggesting he'd either bypassed sleep entirely or had given up on it hours ago.
In the pale, weak light, the curse markings on his hands looked like fresh ink, pulsing with that slow, rhythmic vitality that I could no longer look at without feeling the hunger in my own blood stir in response.
"You need to sit down for this," I said, my voice sounding like gravel.
Caius didn't argue. He read the tension in my shoulders, the way I was holding the leather-bound book, and the exhaustion I hadn't quite managed to mask.
He sat on the edge of the unmade bed.
I took the chair opposite him, opened the journal to Maren's final entry, and slid it onto the mattress between us. I pointed to the words.
He read them. Then he read them again, his chest staying unnervingly still. When he finally looked up, his eyes were two voids of dark intensity.
"What does this mean? A key to what exactly?"
"I don't know," I admitted, my voice dropping. "My mother found the reference in a text that predates the current maps. She died before she could name the lock. But the logic is terrifyingly sound... if you design a curse as a mechanism instead of a punishment, you do it because you need something triggered. Something that requires a specific bloodline to act as the conduit."
Caius stood. It was deliberate rise of a man who could no longer contain the lightning under his skin. He walked to the window, staring out at the courtyard where the first weak rays of gold were beginning to thaw the frost on the cobblestones. Standing there with his back to me, I could see the black veins crawling up his neck, pulsing in time with his heart.
I wondered, for the first time, what it felt like to realize your entire tragedy was a blueprint. To discover that three years of being slowly hollowed out from the inside wasn't a stroke of bad luck or a divine whim, it was a plan.
He had been chosen. His agony was the fuel for someone else's engine.
"Which evil soul placed it?" he asked, his voice a low, vibrating hum of controlled fury.
"We don't know yet."
"But someone does," he countered, turning to face me. "Someone built this. Someone has been sitting in the dark for three years, watching the clock, waiting for this thing to do exactly what it was engineered to do. And whatever that is—"
"It requires your life and the curse to be in the same place at the same time," I finished for him. "Which they have been. Every second for three years."
The look on his face changed immediately to a cold, crystalline clarity; the face of a strategist who had just realized the board was ten times larger than he'd thought. It was the same look he'd given me the night he pulled back the carriage curtain: focused, dangerous, and utterly decided.
"If the curse is a key," he said, the words falling like iron, "and a Bloodanchor can break it... then breaking it is the only way to destroy the lock. To keep whatever is on the other side from getting out."
"Yes that's correct."
"Which means whoever designed this doesn't want it broken. They want the turn. They want the opening."
"Exactly, smart observation I pointed out."
"Which means," he said, stepping closer until the air between us tasted like ozone, "they know about you. They've known since you crossed the border."
The room fell into a suffocating silence.
Outside the room, a solitary bird called out from the trees of the winter garden and then went quiet, as if even the wildlife sensed the shift in the world's weight.
The frost in the courtyard was catching the light now, sparkling like a thousand diamonds.
The architects knew. They had watched Vex spy on us. They had watched Reva's desperate betrayal. They had watched Halvenmere burn and then go cold. But they had remained silent because they were either infinitely patient or horrifyingly confident that a nineteen-year-old girl with eight weeks of training couldn't stop a three-century-old mechanism before it reached its final turn.
"We need Aldric," I said.
"We need more than that," Caius replied. "We need the text your mother was hunting. If she found a reference to this being a key, she found it in something ancient. If that text still exists —"
"I'll find it," I said, already flipping through the pages of the journal. "She was thorough. She documented her sources in the margins. I just haven't finished the later chapters."
"Read faster," he urged. It wasn't a command; it was the plea of a man who had just found out his own death was a gear in a larger machine and was trying to find the crowbar to jam it.
We spent the next three hours in that room, the rising sun washing the walls in a harsh, unforgiving light. I read aloud, my voice turning hoarse, while he listened with a stillness that was almost predatory.
We ignored the calls for breakfast, the shifting of the guards, and the mundane business of the fortress. The ground had shifted beneath Ironveil, and only we could feel the tremor of it.
By the time Kael's insistent knock came at the door, I had found it.
The source was the Valdenmere Codex, a forbidden manuscript penned three hundred years ago by a scholar named Cass Veldri; a man who had spent his life documenting the 'Old Magic' before the territorial powers systematically erased it from history.
My mother had tracked a copy to a private, heavily guarded archive in the eastern reaches. She had scrawled the location in tight, frantic letters and underlined it twice, as if trying to shout through the paper.
It was in a city called Ashenmoor. A three days' ride to the east.
Deep inside Greyveil territory.
The one book that could explain what Caius was being used to unlock was sitting in the heart of the enemy's lands; the very man who had the most to gain by making sure the key turned.
Of course it was.
Of course it was sitting in the lion's mouth.