They ran.
Clyde had one hand pressed against his side where the deeper of the two cuts was still bleeding, the fabric of his shirt already dark with it, the sting of it sharpening with every step. Aurelian was ahead of him by half a stride, moving through the library's main corridor toward the exit with the focused efficiency of someone who had decided that speed was more important than looking calm.
Behind them, something stirred.
Grrrk.
The Howling woke up.
Clyde glanced back and immediately wished he had taken the extra second to assess before looking. The thing that Caelan had brought through the vortex card was roughly human in its original proportions and had long since stopped being human in any other sense. Its body had been restructured by the Howling heart transplanted into its chest, the corruption spreading from that point outward through the biological architecture over what must have been a significant period of time. Its skin had taken on the deep blue suffusion of advanced corruption, pulled tight over a frame that had elongated at the joints, the elbows and knees extending further than they should have in directions they were not designed for. Its fingers had fused in pairs and hardened into something closer to bone than flesh. Its face retained the basic geometry of a human face and that was the worst part of it, the eyes and nose and mouth all present and approximately in the right locations and the expression behind them belonging to something that consumed rather than thought.
CRASH.
The bookshelves on either side of the corridor lurched inward, their contents scattering, the shelving units themselves moving with the purposeful geometry of something being directed rather than falling. They closed across the corridor exit ahead of Clyde and Aurelian like gates swinging shut.
Then the walls began to move.
The library's architecture folded, sections of ceiling and floor and wall separating into segments that rearranged themselves with the grinding, deliberate sound of stone obeying instructions, grind grind grind, the whole space reconfiguring into a series of interlocking cubic chambers that contracted around them, reducing the available space in every direction simultaneously.
CLANG. CLANG. CLANG.
Walls on three sides. Ceiling dropping. The bookshelves sealing the fourth.
Caelan's voice came from somewhere above the contracting structure, carried downward by the acoustics of the enclosed space, completely composed.
"You saw something you were not supposed to see. That makes this necessary."
Clyde pressed harder against his side and looked at Aurelian.
This family, he thought, is genuinely, completely insane. The reports understated it.
"The Howling first," Aurelian said, already turning.
BANG. BANG. BANG.
He fired three compressed air rounds from his fingers in rapid succession, the crack of each one filling the enclosed space with a sharpness that the shrinking walls reflected back doubled. The rounds hit the Howling's chest and the Howling absorbed them, stumbling back one step and then continuing forward, the corruption in its structure dense enough to distribute the impact across too wide an area for the concentrated shots to find the heart.
Clyde took the Clockwork card from his pocket.
He pressed the cut on his palm against its surface. Hisssss. The familiar drain began, the cogs spinning faster, the clock face accelerating.
He chanted in his mind, moving through the Latin with the speed of something practiced past the point of conscious effort.
Tempus, umbra ultimae horae, dissolve filum tuum sine fine et sine ut potestas tua antiqua hunc secundum cruentem consumat.
Ring.
Tempus auge.
Yellow light flooded the contracted space.
The Howling slowed. The walls slowed. Everything around Clyde dropped to a fraction of its normal rate and he moved through the gap, butterfly knife resonating purple in his hand, and opened cuts across the Howling's side and arm and the back of its knee in three rapid passes.
Slice. Slice. Slice.
Dark ichor bled from each cut. The Howling registered the damage in the slowed time with the specific quality of something that felt pain and had learned to function through it rather than respond to it.
Then the yellow light began to fade.
The wound, Clyde thought, feeling the warmth spreading from his side as the exertion pushed blood through the cuts faster. The clockwork drain and the blood loss together.
The acceleration dropped.
Everything snapped back to full speed and Clyde stepped back, breathing harder than he wanted to be, one hand going back to his side.
Aurelian moved to take his place, Gale Ichor coating his fists as he came forward, the wind wrapping his knuckles in the compressed, humming quality of something ready to discharge on contact.
WHUMP.
His first punch connected with the Howling's jaw and the force of it snapped the creature's head sideways. The second hit its ribs. The Howling absorbed both and sent one arm in a wide arc that Aurelian ducked under.
Then the threads appeared.
Thin, nearly transparent, the same Lunar Ichor threads that Caelan had used, emerging from the floor where Caelan's card had altered the architecture and wrapping around Aurelian's legs before he had registered their presence. They pulled simultaneously in opposing directions.
Snap.
Aurelian went down on one knee, and the Howling's momentum carried its next strike through the space where his head had been, and then the threads adjusted and pulled harder, and the combination of forces produced a sound that Aurelian's body made before his face confirmed the damage.
Pfft.
He coughed blood onto the floor of the contracting chamber and stayed on one knee, one hand braced against the stone, his breathing disrupted.
Caelan's voice again, from above.
"Farewell."
Whoosh.
The vortex card opened, the same spinning black disc from before, and Caelan stepped through it backward, taking the figure with the transplanted Howling heart with him, leaving only the original Howling in the sealed space with two Ichorborn, one bleeding and one on one knee.
The Howling turned its attention fully to them.
It moved with the gathering momentum of something that had been patient through the preceding events and was now done being patient, the elongated joints carrying it across the contracted space in fewer steps than the distance should have required.
Aurelian reached into his coat with the hand that was braced against the floor.
He produced a card, held it flat in his palm, and pressed the cut across his thumb against its surface.
Hisssss.
The card was dark, its surface the specific dark of something that absorbed light rather than reflecting it, with Latin characters running along its edges in a script that felt older than the Clockwork card's Latin, the words carrying a different quality of weight.
He began to chant, his voice low and steady despite the blood at the corner of his mouth.
"Caligora, mater umbrarum et noctis perpetuae, exaudi vocem meam. Per sanguinem meum te invoco. Umbrae tuae surgant et vinciant, tenebrae tuae obediant et contineant."
(Caligora, mother of shadows and endless night, hear my voice. Through my blood I call upon you. Let your shadows rise and bind, let your darkness obey and contain.)
WHOOOM.
The light in the contracted chamber dropped by several degrees as something answered the chant from below, a darkness that was its own phenomenon rather than simply the absence of light, pooling in the floor's shadows and deepening them and then reaching upward through them with purpose.
Hands. Dozens of them, emerging from the shadow pool that had formed beneath the Howling, each one dark and semi-solid, grasping upward with the coordinated certainty of something that had been told exactly what to hold and intended to hold it.
CRACK. CRACK. CRACK. CRACK.
They wrapped the Howling's ankles and legs and torso simultaneously, each hand pulling in a slightly different direction, the collective effect being a complete immobilization that the Howling strained against and failed to break, its corrupted strength distributed across too many points of resistance to overcome any single one.
Clyde straightened up.
He opened his Hollow Eyes and located the heart through the Howling's chest wall, the corrupted pulse of it visible as a discordant signal in the frequency layer, its location slightly left of center behind the sternum.
He pressed his palm against the flat of the butterfly knife and let the resonance build, the purple of his ichor moving into the blade with the clean, complete unity of absolute resonance, every particle of ichor doing precisely what it needed to do and nothing else, the material of the knife shifting in quality under his hands as the frequency saturated it.
He drove the blade forward.
The floor materialized in front of it.
CLANG.
Stone, two inches thick, conjured directly in the knife's path, the blade's tip stopping against it with a vibration that traveled through the handle and into Clyde's palm. Around them, additional walls began spawning from the surrounding architecture, the cubic contraction resuming with renewed purpose, the space shrinking toward a size that would make movement impossible within seconds.
Aurelian flicked his wrist.
CRACK. CRACK.
Two air rounds hit the conjured stone wall directly and the stone held, the Gale Ichor distributing across the surface rather than penetrating it.
The Howling's straining against the shadow hands intensified, the corrupted strength of it finding the threshold of what the hands could contain, the grip beginning to slip at the edges.
Then the temperature dropped.
Sharply, immediately, the kind of temperature drop that the body registers before the mind has processed what is causing it, the air in the contracted chamber going from the ambient warmth of an enclosed space to something several degrees below comfortable in the span of two seconds.
Tink. Tink. Tink.
Ice spikes formed at the Howling's feet, small at first, then larger, growing up from the floor in geometric precision around the Howling's immobilized legs, the ice a specific light blue so pale it was almost white, each spike translucent and sharp.
The Howling looked down.
Its feet were encased in ice up to the knee, the growth still continuing, the cold spreading upward through the shadow hands' grip and reinforcing them with a material rigidity that the Howling's strength could not distribute across as easily.
Snowflakes fell from somewhere above them.
Inside an enclosed space, with walls on every side.
Clyde looked up.
She stood at the top of the highest remaining wall, the white hair moving slightly in a cold air current that she appeared to be generating herself, her pale face carrying its usual absence of readable expression, her light blue jacket perfectly still in a way that suggested the cold did not register for her the way it registered for everyone else in the space.
In her hand, a card.
Pale blue, with a symbol on its surface that his Hollow Eyes resolved as an elemental symbol, a stylized snowflake rendered in silver and white within a cyan circle.
Nivis, he thought, reading the frequency. An elemental card. Ice and snow.
She pressed her pale finger against the card's edge. A thin line of red appeared, dark against her white skin.
Drip.
Her voice arrived in the cold air of the contracted space like something that had always belonged in that temperature.
"Ice Spear."
The elemental symbol on the card blazed. Light blue and cyan, the snowflake at its center expanding, the energy building with the specific quality of something that had been held in compressed form and was being given direction and permission simultaneously. A shape formed in the air above the Howling, long and tapering, the ice constructing itself in real time with geometric precision, four-pronged at its tip like the tines of something designed to pierce rather than cut.
CRACK.
It drove downward through the Howling's chest.
The sound the Howling made was less a scream and more a frequency, a corrupted ichor signal losing its coherence all at once, the organizing principle behind the corruption ceasing in the moment the spear found the heart. The Astral Card inside shattered, the metallic snap of a sigil breaking audible even through the Howling's dissolving body.
CRACK.
Then it was dissolving, the corrupted tissue breaking down with the same rapid decomposition Clyde had seen before, the ice dissolving with it as the cold that had been sustaining it withdrew with the Howling's collapse, the temperature in the contracted space already beginning to recover.
Clyde breathed.
He looked at the space where the Howling had been.
"What was that card?!" he asked.
"Elemental card," Aurelian said, standing carefully, one hand still pressed against his ribs. "Nivis. Authority over snow and ice." He looked at the card in the girl's hand as its glow faded, the cyan symbol etching itself dim, the surface returning to its pale base color. "Single use per activation but the power output is exceptional."
Aurelian looked up at where she still stood on the wall.
"Your name?" he asked.
She looked at him with the same cool directness she had applied to everything.
"Seraphina," she said. "Seraphina Nox Arktis."
Clyde turned his Hollow Eyes to the floor where the Howling had fully dissolved.
Something remained.
Small, dense, spherical, sitting in the residue with the specific luminous quality of something that had been compressed over a long period of time and retained the compression even after its housing was gone.
An orb.
The ichor dimension book, he thought immediately. High-phase Howling. Brain orb. One star in the constellation.
He produced the butterfly knife and used the tip of it carefully, the way you might use a tool you were trying to keep clean, to lift the orb from the dissolving residue. It was warm against the flat of the blade, lighter than it looked.
He transferred it to his coat pocket carefully.
The walls around them were retreating. The bookshelves that had sealed the exit were returning to their positions with the grinding sequence of architecture reversing its instructions. The cubic contraction had simply stopped, the structures spawned by Caelan's card dissolving with its wielder's departure through the vortex.
The library was reassembling itself around them into something resembling a library again.
"You are part of the Lunar Sentinels?!" Aurelian asked, looking at Seraphina, something between assessment and curiosity in his voice.
"I am protecting my classmates," she said, descending from the wall with the ease of someone for whom that height had been unremarkable.
"How did you know we were here?!" Clyde asked.
She looked at him with those pure blue eyes, the snowflake symbol just visible in each iris.
She said nothing further.
Before Aurelian could find the next question, her body went still, the kind of still that preceded something rather than following it, and then the surface of her skin took on the translucent quality of ice forming from the inside outward, and then she shattered.
CRACK.
Ice shards scattered across the library floor, catching the Luminance card's warm light, and where Seraphina Nox Arktis had been standing there was only the cold air she had left behind, already warming back toward the ambient temperature of the space.
Clyde looked at the ice shards.
"Did she—?!" he started.
"Ice substitution," Aurelian said, with the tone of someone who had encountered this before and had processed the shock of it on a prior occasion. "She was never fully there. The real her is somewhere else right now."
He put his hand on Clyde's shoulder and steered him toward the library exit, which was now fully restored to its normal configuration.
"Academy hospital," Aurelian said. "You are still bleeding from two places and I may have a cracked rib."
Clyde looked down at his side.
He is right, he thought. Hospital first. Everything else after.
He let Aurelian steer him out of the library and into the corridor beyond, the warm golden light of the Academy's artificial sun following them all the way.