A shadow can pass through walls when the walls themselves are built on secrets.
The heavy stone door of the vault groaned under the force of the imperial battering rams, but Marcus had already thrown his shoulder against a false brick in the far corner. A iron grating slid sideways, revealing a narrow hole that smelled intensely of stagnant water and old copper.
"Move, my prince," Marcus whispered, ushering Arthur through the gap just as the main archive doors splintered into fragments behind them. "Drop straight down. Do not worry about the mud."
Arthur lowered himself into the dark tube, sliding down a slick, narrow pipe before landing on both feet in a wide brick tunnel. Marcus dropped down right behind him, panting heavily, his face drenched in cold sweat. They moved quickly through the labyrinth of the underground sewage lines, the distant barking of the bloodhounds fading into a muffled echo above their heads.
After twenty minutes of frantic navigating through the dark, Marcus paused beneath a rusty iron ladder. He pushed the hatch upward, allowing a sliver of dim moonlight to cut through the darkness.
Arthur climbed out first, finding himself in the absolute center of the outer ring slums. The air here was thick with the smell of cheap coal smoke, rotting timber, and crowded poverty. Lean-to shacks made of scrap metal and rotted wood leaned against each other for support, stretching out as far as the eye could see.
"We are safe for the moment," Marcus said, climbing up the final rung and carefully lowering the iron grate back into the dirt. "The imperial guard does not enter this sector after dark unless they are in groups of fifty. They are terrified of getting a knife between their ribs."
Arthur looked around the quiet, muddy alleyway, adjusting his tattered leather cloak. "They should be terrified. This place is a tinderbox. Where are we going?"
"My cellar is just around this corner," Marcus said, pointing his short sword toward a low wooden door reinforced with iron bands. "Come inside quickly before a lookout spots us."
The cellar was small, damp, and lit by a single tallow candle that cast long, flickering shadows across the dirt walls. A makeshift wooden table sat in the center of the room, covered in rusted tools and half-broken clockwork gears. Arthur unrolled the stolen tactical map across the rough surface, his eyes instantly tracking the main roads.
"Now that we can breathe, tell me what Victor is planning," Arthur demanded, leaning his palms against the table. "The scout said he is consolidating power, but a man does not change guard shifts every two hours just because he is nervous."
Marcus sat down heavily on a wooden crate, rubbing his aching, scarred thigh. "It is much worse than a simple political alignment, Arthur. Three days ago, Victor’s personal vanguard intercepted a massive, highly restricted shipment of rare spirit stones. They were originally mined in the eastern peaks and meant to power the defensive barriers of the outer ring."
"Why would he intercept his own defensive resources?" Arthur asked, his brow furrowing.
"Because he does not care about defending the outer ring," Marcus said, spitting on the floor in disgust. "He is redirecting every single stone to the inner palace vault. My sources inside the lower courts tell me he is preparing for a dark ascension ritual during the upcoming celestial eclipse. If he activates the ancestral energy core with those stones, his personal power will become absolute. Nobody will be able to touch him."
Arthur stared at the map, his fingers tracing the outline of the primary military depot located on the border of the middle ring. "The stones are being held at the central depot before they move to the inner palace, correct?"
"Yes, the high security depot near the iron barracks," Marcus confirmed, looking up with a worried expression. "It is heavily fortified. They have twenty guards on the perimeter and an elite captain stationed inside the courtyard."
"Then we take the stones tonight," Arthur said, his voice flat and determined.
Marcus jumped to his feet, wincing as his bad leg buckled slightly. "Are you insane, boy? That depot is a fortress. You just escaped a palace sweep by the skin of your teeth."
"Think about it logically, Captain," Arthur said, turning to face him. "If we steal that shipment back, we accomplish two things at once. First, we completely cripple Victor’s immediate momentum for his ritual. Without those stones, his ascension plan is delayed. Second, we return those stones to the grid or use them as leverage. The people in these slums will see that the new Grand Lord is not invincible."
Marcus looked at the map, then back at Arthur’s face, seeing the unyielding determination in the young man's eyes. He let out a long, slow sigh. "It is a suicide mission, but you are right about the leverage. If the stones move to the inner palace tomorrow, we will never get another chance."
"How do we break the perimeter?" Arthur asked, leaning over the leather scroll again. "I cannot use my cosmic energy outside the walls without drawing the attention of every mage in the sector."
"The depot has an old maintenance tunnel used for clearing out coal slag," Marcus explained, his finger tapping a small square icon on the stolen document. "It leads directly beneath the central vault floor. The guards do not watch it because the hatch is bolted from the inside with three iron bars."
"I can cut through those bars silently with my smaller daggers," Arthur said. "What about the guard rotation inside the courtyard?"
"They change watch exactly at midnight," Marcus said. "There is a three minute window where the watchtowers are completely blind while the men switch positions. That is your only window to cross the yard and breach the vault door."
"Good," Arthur said, pulling his hood over his head. "Stay here and keep your ears open. If things go wrong, do not come looking for me. Save whoever is left of the old vanguard."
"I will be waiting right here, my prince," Marcus said, his voice thick with emotion. "Do not let them catch you."
Two hours later, the capital city was shrouded in a thick, midnight fog. Arthur moved like a ghost through the shadows of the military district, his boots making absolutely no sound against the damp stone walls. He found the entrance to the coal slag tunnel hidden behind a pile of rotting timber. He slid inside, navigating the cramped, soot-blackened passage until he reached the iron hatch.
Using his heavy hunting knife and a concentrated, unvoiced pressure from his palms, he pried the rusted iron bolts apart one by one. The metal groaned slightly, but the sound was completely swallowed by the howling wind outside. Arthur pushed the hatch upward, slipping into the cold, silent interior of the central military depot.
The room was vast, filled with high wooden shelves and covered in the dark sigils of the imperial army. In the center of the room stood three massive, iron-bound wooden crates, each one sealed with the official wax emblem of the eastern mining guild.
Arthur smiled grimly, stepping closer to the nearest crate. "Your ritual ends tonight, Uncle."
He slipped his dagger beneath the heavy iron latch of the central vault crate, prying the wood open with a sharp, calculated jerk. The lid popped loose, lifting smoothly.
Arthur froze.
The crate was completely empty of spirit stones. Instead, the interior was packed tightly to the brim with dark gray blocks of volatile imperial military explosives. A thin, silver trigger wire ran from the underside of the lid directly down through a hole in the bottom of the container.
Before Arthur could draw a breath to react, a sudden, heavy sinking feeling occurred beneath his right boot. The stone tile he was standing on dropped a fraction of an inch into the floor, making a clean, hollow click sound. It was a hair-trigger pressure plate, rigged to detonate the entire building the moment his weight shifted.