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Grinding Gear-Sluice - AI-generated fantasy Hazard

Grinding Gear-Sluice

A series of heavy, interlocking brass gears hidden beneath a thin layer of cave dust and loose shale. Originally designed for ore processing, these ancient mechanisms now act as a lethal leg-trap for the unwary.

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Hazard EntryMechanicalLevel2Simple

Grinding Gear-Sluice

2LevelCommonRarityCavernEnvironment
MechanicalTrap
Level2
|
HP30
|
AC18
|
TypeMechanical
|
ComplexitySimple
|
RarityCommon

Defenses

AC18
Hard8
HP30
BT 15
Fort+11
Ref+5
Will+0
Immune
Critical Hits, Object Immunities, Precision Damage
Resist
Fire 5, Piercing 5
Weak
Cold 5, Electricity 5
MechanicalTrap

Detection

PerDC 18
StlDC 18 (Trained)
InitN/A

“Partially buried in the cavern floor is a large, flat slab of limestone that sits slightly higher than the surrounding rock. Beneath the edges of this slab, the dull glint of oiled copper and iron teeth can be seen by those looking closely.”

Standard Engagement

Trigger

A creature walks onto the pressure-sensitive limestone slab.

Routine

N/A

Reset

The trap reset occurs automatically after 1 minute as hydraulic pressure pulls the gears back into their housing.

Crushing Grasp

The gears snap shut and grind with immense force. The triggering creature must attempt a DC 18 Reflex save. On a failure, the creature takes 2d8+6 bludgeoning damage and is Grabbed (Escape DC 18). On a critical failure, the creature takes double damage and is Restrained (Escape DC 18). On a success, the creature takes half damage and is not grabbed.

Hydraulic Power

The gears are powered by water pressure. If the water source is diverted or frozen, the hazard becomes inactive.

Description

A series of heavy, interlocking brass gears hidden beneath a thin layer of cave dust and loose shale. Originally designed for ore processing, these ancient mechanisms now act as a lethal leg-trap for the unwary.

Discovery

A DC 18 Perception check allows a character to notice the faint, rhythmic ticking of a heart-beat timer and the scent of ancient machine oil rising from the floor.

Archival Lore

“These devices were once part of an automated sorting system created by a forgotten clan of deep-dwelling smiths. Though the halls are now empty, the subterranean springs still provide the hydraulic pressure needed to keep the gears spinning.”

Environment
Cavern
Theme
Clockwork
Creator
Deep-iron Dwarven Engineers
Purpose
Automated ore crushing and intruder deterrence.
Game System
Generic Fantasy
Art Style
Technical parchment sketch with cross-sections of gears and hydraulic pistons, accented with verdigris-green and rust-brown watercolor washes.
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