D20 SYSTEM✦ Normal

The Brass Labyrinth: Echoes of the False Passphrase

# Construct# Intrigue# Dungeon# Magitech

Deep beneath the rust-choked city of Cogsgate lies the Brass Labyrinth, a colossal, sentient clockwork fortress built by a long-dead artificer dynasty. Its purpose is forgotten, its 'Maximum Defense Protocol' now ancient and unpredictable. A rogue's failed attempt to bluff their way in with a false passphrase has activated the 'Mechanical Patrol Arbitrary Salvos'—autonomous war constructs that now roam the streets above, while inside the labyrinth, the Protocol is rewriting its own security. Two factions race to control the labyrinth's heart: the Clockwork Covenant, who worship the machine and seek to restore its original, orderly programming, and the Free Cogsgate Union, who believe the labyrinth's core is a weapon that can free their city from all external rule. You are caught in the brass gears, forced to navigate a maze that is both prison and prize.

Chronicle Prelude

The party arrives in the besieged district of Cogsgate's Undercity. Above, the rhythmic stomp of Mechanical Patrols echoes. Ahead, the primary entrance to the Brass Labyrinth—a massive, iris-shaped brass door—is sealed, surrounded by the terrified refugees and the tense, ideological standoff between the Clockwork Covenant's robed technicians and the Free Cogsgate Union's armed rebels. The air smells of ozone and desperation.

Environmental Traits

The 'Maximum Defense Protocol' is a cascading system failure. The labyrinth is not just a dungeon; it is a trapped, thinking entity. Activating its core means either resetting the entire clockwork city to a state of static 'order' (annihilating free will) or overloading it to create a localized reality-warping 'liberation field' with unknown, potentially catastrophic consequences. Both outcomes could stop the rampaging patrols above.

Legendary Archetypes

Rayan

HP:45

STR:16

WIS: 12

CHA:11

Key Factions & Autonomous Nodes (8)

Covenant High Artificer Valerius
A tall, gaunt figure in pristine white robes with golden gear motifs. His left eye is replaced by a multi-lensed monocle that clicks and whirrs as it focuses. His hands are delicate, mechanical prosthetics of polished brass.
Union War-Chief Kaelen
A broad-shouldered figure scarred by shrapnel and burns, clad in mismatched leather and scrap-metal armor. A crude mechanical arm, fashioned from a drone's limb, ends in a vice-like clamp. Her eyes burn with fierce, desperate intelligence.
Jax, the Original Rogue
A gaunt, trembling humanoid wrapped in a stained cloak. His eyes are wide with paranoid terror, darting to every shadow and sound. He smells of old sweat and machine oil, and clutches a leather journal to his chest like a shield.
Salvo Drone Swarm
A cluster of six insect-like drones, each the size of a large dog. Their brass carapaces are scuffed and dented, and their single red optical sensors glow with a constant, menacing light. They move in eerie, synchronized patterns.
Patrol Commander
A towering construct of polished brass and dark iron, standing nine feet tall. Its torso is a reinforced vault, and its head is a single, sweeping optical sensor. It moves with heavy, deliberate purpose, its limbs hissing with steam.
Covenant Harmonizers
Two tall, slender constructs of mirrored glass and silver filigree. They move in perfect, silent unison, their bodies emitting a soft, harmonic hum and projecting beams of focused light that dance across the crystalline walls.
Logic Spider
A small, skittering construct with a spherical brass body and eight spindly, multi-jointed legs. Its underside glows with a web of blue circuitry. It moves erratically, pausing to tap surfaces with its front legs as if scanning for errors.
Prime Arbiter
A colossal, dormant construct seated upon a throne of interlocking gears in the Core Nexus. It is forty feet of inert brass and dark iron, its form a fusion of humanoid and machine. Its chest cavity houses a massive, dark crystal, and its head is a featureless dome with a single, dormant optical lens the size of a shield.

Chronicle Prelude

Environmental Traits

Legendary Archetypes

✦ Related Cases ✦

The Lost Workshop: Heart of a Raging Core

The Iron Chasm Collapse