Regression of the Tower's Final Survivor-Chapter 41: Floor 10 — The Iron Fortress

The Iron Fortress was a masterwork of mechanical precision, every corridor perfectly aligned with every joint and rivet placed with mathematical exactness.

The walls thrummed with the pulse of some vast engine buried deep within the structure while the air carried the constant hiss of steam venting through pipes that ran like veins through the metal body of the floor.

"This place is alive." Ren kept his shield raised despite the absence of immediate threats, his eyes scanning every shadow. "In a way the other floors weren’t."

"The Iron Fortress is semi-sentient, so it observes and learns and adapts to whatever you throw at it." Dante led them through a corridor that matched his memories almost perfectly. "The longer we’re inside, the more it understands how we fight."

"Wonderful." Astrid’s voice dripped sarcasm as she cracked her knuckles. "A floor that gets smarter the more we kill."

They moved in tactical formation with the seven-person party spread out enough to avoid being caught in a single attack but close enough to support each other. Leon and Ren alternated point, their shields providing mobile cover against the steam-powered golems that emerged from maintenance alcoves at unpredictable intervals.

The golems were relentless but predictable after the first few encounters: charge, swing, overextend. The party exploited the pattern with mechanical efficiency of their own, cutting through each wave faster than the last.

[Enemy slain: Steam Golem x4]

[System points: +400]

"The fortress is testing us." Dante wiped his blade clean during a brief rest in a corridor junction. "Learning our capabilities before the main event."

"The Iron Warden?" Seira leaned against the wall, her seer abilities clearly draining her. "I keep getting flashes of something huge, metal and steam and something that feels like anger."

"That’s accurate." Dante checked their supplies and found healing potions running low with mana reserves depleted while everyone carried minor injuries that added up to significant combat disadvantage. "The Warden is the largest construct the Tower produces, so in my original timeline we fought it with eight people and lost half of them."

"Very encouraging." Astrid stretched her arms, working out the tension in her shoulders.

"I’m being realistic since we need to be prepared for the worst fight of our lives."

---

The fortress’s interior grew more hostile as they approached the central chamber, with traps that hadn’t existed an hour ago materializing in their path.

Pressure plates triggered steam jets that could strip flesh from bone. False floors dropped into grinding machinery that would turn a body into paste. Walls slammed together with crushing force that left dents in the metal where Ren’s shield caught the blow. The construct was no longer content to observe since it was actively trying to stop them.

Seira’s warnings saved them repeatedly, her seer abilities detecting threats moments before they manifested. Her value to the team was undeniable, whatever complicated feelings Dante harbored about their shared history.

"Left wall, three seconds!" She grabbed Leon’s arm, pulling him right.

They pressed against the right side of the corridor as a section of the left wall extended on hydraulic pistons, revealing spinning blades that would have carved through flesh and armor alike. The blades retracted after ten seconds, leaving gouges in the opposite wall deep enough to bury a fist in.

"This is getting worse." Leon gasped, his burned side clearly paining him. "The closer we get—"

"The more desperate it becomes." Dante gestured forward. "That’s a good sign since it means we’re threatening something it wants to protect."

The central chamber doors appeared at the end of a long corridor, massive slabs of steel covered in warnings written in languages no human had ever spoken. The symbols pulsed with containment magic, barriers designed to keep something inside rather than keep intruders out.

"This is it." Dante surveyed the party, assessing their condition and finding them battered and exhausted, running on determination more than reserves. But alive. "Behind those doors is the Iron Warden, the boss of Floor 10, the hardest fight any of us have ever faced."

"Any last-minute advice?" Astrid’s question was only half-joking as she rolled her shoulders.

"Stay alive, protect each other, and trust me when I call tactics." He looked at each of them in turn: Ren, solid and dependable with his shield already raised. Astrid, fierce and unbreakable with anticipation in her eyes. Ravenna, transformed and powerful with her Hellfire flickering at her fingertips. Seira, complicated but committed with sweat on her brow. Leon, wounded but still standing with his jaw set against the pain. Sera, exhausted but still ready with her staff gripped tight. "We’ve come too far to die here."

"Inspirational." But Astrid was smiling as she cracked her neck. "Let’s kill a giant robot."

Dante put his hand on the door, feeling the metal warm beneath his palm, vibrating with the presence of whatever waited beyond. He could sense the Warden’s awareness, dormant but present, detecting the threat that approached its chamber.

"Ready?"

Ren nodded, shield raised. Leon grunted affirmation. Astrid cracked her knuckles with obvious anticipation. Ravenna met his eyes, ember-glow steady. Sera gripped her staff tighter. Seira squared her shoulders.

He pushed the doors open.

---

The boss chamber stretched cathedral-vast around them, vaulted ceilings of riveted steel reaching upward into shadows that no light could penetrate.

Massive pillars supported the structure, each one thick enough to hide behind, covered in pipes that hissed with pressurized steam. The floor was a grid of metal plates, some stable, others designed to shift and trap unwary fighters.

At the chamber’s center, dormant but unmistakably present, stood the Iron Warden in all its terrifying scale.

’Twenty meters tall at minimum, its body a mountain of articulated plates and grinding gears.’

Dante forced himself to catalog the threat instead of freezing. Four arms extended from its torso, each ending in different implements: a hammer that could crush stone, a shield nearly as tall as Ren, a multi-barreled cannon, and something that looked like a giant human hand designed to grab and crush.

"That’s..." Sera’s voice failed her, her staff trembling in her grip.

"The Iron Warden." Dante finished for her, his voice steady despite what he was feeling. "Designed to stop anyone from reaching Floor 11."

[Floor 10 boss: The Iron Warden]

[Classification: Siege construct]

[Threat level: Extreme]

[Phases: 3]

[Recommended party size: 8-12]

"We have seven." Ren observed, shield already shifting into defensive position. "One below minimum."

"We’re not minimum climbers." Dante drew his Champion’s Blade, feeling the weapon hum with anticipation. "Tanks, forward position. Ranged, spread to the flanks. Astrid, you’re our breaker, so find weak points and exploit them."

They moved into formation as the chamber doors sealed behind them with a boom of finality that echoed through the space.

[Boss encounter initiated]

[The Iron Warden awakens]

The construct stirred, gears grinding against each other with a sound like metal screaming. Steam vented from every joint and seam, filling the chamber with mist that made vision difficult. The Warden’s head, a featureless dome of polished steel, rotated until it faced the party directly.

Its eyes, if they could be called that, began to glow with blue light that illuminated the mist around it.

The Warden moved, and the floor shook beneath their feet.