Azure mist curled away from their boots as the team stepped into the fourth chamber.
The temperature shifted again — this time downward, but not into cold.
Into pressure.
The kind of pressure you felt before thunder struck metal.
Rezion whispered, "Anyone else feel that?"
Even Frostwing dimmed its glow in caution.
Riley stepped forward, Arcial at his side, both tense.
The chamber opened like a cavern carved by lightning itself — tall, ribbed walls of blue stone spiked upward, each striated with flickering veins of stormlight. The ground was smoother here… too smooth.
Hayes eyed the flooring.
"Something's wrong with this surface."
Jonathan tapped it with the end of his shield.
Stone… but hollow underneath.
Hayley sighed. "I hate when rooms are named after the dungeon."
Riley raised a brow.
"What?"
Hayley shrugged. "Azure Hollow. You know. Because it's hollow. Because we're going to fall. To our doom. Again."
Aria muttered, "Can we not prophesy death every chamber?"
Ether gently tapped her forehead in agreement.
Dot nodded sharply from her hair.
Before Riley could answer—
A low, rolling vibration rippled through the stone.
Not like footsteps.
Like something massive breathing beneath them.
Sofia stiffened. "Riley… something's under the floor."
As if responding, the system flared:
> Mid-Boss: Hollow Echo Sentinel (Lv 14)
Guardian of the Azure Hollows.
Detects pressure, sound, and spirit signatures.
Warning: Floor integrity unstable.
Kipp squeaked.
"WE'RE STANDING ON A BOSS—"
Mira slapped a hand over his mouth.
Arcial arched his back, fur sparking violently.
Riley scanned the arena.
The pillars ringing the chamber weren't just decoration.
They shimmered faintly with different sigils — Moon, Verdant, Storm, Tidal, Flame, Stone.
Resonance pillars.
"Okay," Riley murmured, "we're not fighting it yet. We're waking it."
Jonathan blinked. "What does that even mean—"
The floor snapped downward an inch.
Everyone froze.
The vibration intensified.
Something huge moved beneath the stone.
Riley swallowed.
"It means the fight starts when we panic."
Aria raised a hand.
"I would like to not panic—"
The floor jerked sharply.
"PANICKING IS HAPPENING," Aria squealed.
Ether bonked her.
Even Ether was panicked.
Then—
CRACK.
A massive circular section of floor split open like a blooming flower of stone shards, revealing—
A void.
Not darkness.
Lightning-laced spirals stretching down into a chasm that felt alive.
A monstrous silhouette rose steadily from the depths, eight arms, four legs, and a masklike face carved of stone.
Its voice rumbled like grinding mountains:
"WHO DISTURBS—THE HOLLOW—CHAMBER?"
Jonathan whispered, "Nope."
Kalyani whispered, "Big nope."
Rezion whispered, "Maximum nope."
But Riley just stepped forward.
"We do."
The giant mask turned toward him.
Three glowing eye-slits widened.
"YOU… CARRY THE STORMBACK'S MARK."
Arcial hissed and stepped in front of Riley.
The floor vibrated again.
Not from the boss—
From the pillars glowing brighter.
Riley pointed at them quickly.
"Okay. Mechanics time.
It's tied to resonance."
Hayes nodded slowly, connecting the dots.
"Pillars match affinities. The boss reacts to whichever pillar is empowered."
"Exactly," Riley said. "If the wrong pillar activates, the floor collapses. We need to hit the right one depending on what the boss charges up."
Aria blinked.
"How do we know which is right?"
Lumi chimed once.
All eyes snapped upward as the little spirit drifted into the air, glow spreading out like scanning waves.
He flashed a bright, unmistakable pattern:
Three quick pulses. One long. Then a direction.
Riley's eyes widened.
"He's reading the chamber. That's the sequence."
Kalyani pumped a fist.
"LOOT FAIRY IS A PUZZLE FAIRY!"
Dot smacked her forehead.
The Sentinel's arms began to rotate — each limb glowing a different elemental color.
Rezion paled. "It's randomizing the attack!"
Riley barked, "Lumi—show us the first pillar!"
Lumi darted left, hovering over the Verdant pillar.
Bramble roared and slammed his paws down.
Verdant energy rippled outward—
The pillar pulsed.
The ground under them stabilized.
The boss recoiled.
"VERDANT—RESONANCE—ACCEPTED."
Aria whispered, "I love this room suddenly."
Then the boss' arms rotated again.
This time glowing with cold.
Riley shouted, "Frostwing! Up!"
Rezion released the wisp — it shot upward, trailing soft cold light.
Lumi flashed blue.
Rezion pointed. "Moon or Frost?"
Luna squeaked indignantly.
Rezion quickly corrected, "NO NO I MEANT—WHICH IS RIGHT—"
Lumi pointed sharply toward the Moon pillar.
Luna hopped onto the sigil, horn glowing like a tiny star.
The pillar burst with silver light.
The Sentinel shuddered.
"LUNAR—CALIBRATION—RECOGNIZED."
Jonathan exhaled. "This is manageable."
The boss immediately opened all six inner eyes.
Red. Blue. Green. Yellow. White. Black.
Aria swallowed.
"...Ominous."
The Sentinel's mask cracked open.
A beam of raw storm energy built in its chest.
Riley shouted without hesitation—
"ARCIAL — STORM PILLAR!"
Arcial bolted.
Lumi screamed in sparkle language — a rapid-warning pulse.
Riley read it instantly.
"NO—THE BOSS IS FAKING—SWITCH TO STONE!"
Terror lunged to the stone pillar, slamming both fists into it.
The pillar activated just as the beam fired—
and bent harmlessly around the team, redirecting skyward.
Kipp fainted again. " He really is as useful in a fight as an ashtray on a motorbike" Mira giggled
Aria was yelling, "THIS IS THE BEST DUNGEON EVER—AND ALSO THE WORST—"
Dot patted her.
Then froze.
Riley froze too.
Because the Sentinel's shadow… moved on its own.
Like a separate creature peeling off the floor.
Sofia whispered, "Oh… oh no. Phase two."
The shadow rose behind the boss like a living ink silhouette.
The system confirmed it:
> Shadow-Echo Construct — Lv 14 Mirrors player movement.
Interrupts resonance.
Cannot be harmed while the Sentinel stands.
Hayes groaned.
"Great. A babysitter."
Aria pointed at Riley.
"Shoot the big one!"
Riley nocked an arrow… then stopped.
He looked at Arcial.
At Luna.
At Bramble.
At Kalyani's Gecko.
At Stoneback and Tiger and Frostwing and Dot.
And he grinned.
"No.
Not yet.
We use the pillars first."
The Sentinel's eyes glowed red—
A devastating attack charging.
The shadow-echo lunged.
Lumi flashed the next sequence.
Three pulses.
Two flashes.
A long beam.
And a direction.
Riley's eyes narrowed.
"Alright team…"
He raised Dawnstring.
"Let's break the Hollow. Let's destroy this big lump"