D20 SYSTEM✦ Normal

The Unraveling Circuit of Mithril Vault

# Dungeon# Construct# Magitech

Deep beneath the earth, the Mithril Vault—a lost duergar citadel of unparalleled arcane engineering—has begun to fail. Its sentinel war-golems and guard hounds, once paragons of disciplined defense, now suffer from 'logic deadloops': cascading malfunctions that trigger indiscriminate, violent rampages. A rogue arcanist's experiment with an Arcane Jammer has corrupted the Vault's central command lattice, and the resulting chaos has drawn two desperate factions. You are scavengers, scholars, or hired blades, drawn by the promise of mithril or the need to stop the spreading madness. The Vault does not care about your intentions. It only processes, and the process is breaking.

Chronicle Prelude

You stand in the fungal-lit caverns of the Underdark outpost, 'Dripstone Haven'. The air is thick with the smell of mold and ozone. Scraps of mithril plating are traded like currency, and whispered warnings about 'the rampaging dogs' and 'the broken city' are common. A newly arrived, frantic gnome scholar is offering a small fortune for safe escort into the Vault's outer districts.

Environmental Traits

The Mithril Vault's malfunctioning arcane core is overloading. If the logic deadloops are not stabilized or the corrupted central command lattice is shut down permanently, the rampages will grow more frequent and violent, eventually drawing the attention of far worse things in the Deep Dark, or causing a catastrophic arcane detonation that will seal the Vault and everyone inside forever.

Legendary Archetypes

Rayan

HP:45

STR:16

WIS: 12

CHA:11

Key Factions & Autonomous Nodes (8)

Grindle Gearwright
A frantic, grease-stained gnome artificer with multiple magnifying lenses clipped to his cap. He wears a worn leather apron covered in arcane schematic tattoos.
Captain Korvus Stonefist
A scarred, weary duergar exile in patched-together plate armor. His face is a mask of grim determination, his eyes holding a deep, unspoken grief.
Mad Seer Orva
A wild-eyed Derro oracle, her body covered in ritual scars that glow faintly. She carries a staff topped with a fractured scrying crystal.
Velan of the Silent Knife
A lean, pragmatic drow mercenary clad in dark, mithril-inlaid leather. His movements are precise and economical, his expression one of bored professionalism.
Scrapper Tikka
A nimble deep gnome scavenger draped in straps and pouches, her eyes constantly darting. She wears a necklace of old keys and broken tools.
Logic Echo 7
A disembodied, glitching voice emanating from speaking tubes and scrying pools. It speaks in layered, pained tones, sometimes coherent, sometimes a wash of static.
Guard Hound Alpha
A massive, rampaging mechanical hound, its chassis scarred and sparking. One optical sensor glows a frantic red, the other is dark. It moves with terrifying, broken purpose.
The Packmaster
A horrifying amalgamation of multiple guard hounds fused together by corrupted core energy. It is a towering, twitching mass of metal, claws, and screaming optical sensors.

Chronicle Prelude

Environmental Traits

Legendary Archetypes

✦ Related Cases ✦

The Lost Workshop: Heart of a Raging Core

The Mismatched Components of the Construct Assembly