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Cinnabar Vapor Vent - AI-generated fantasy Hazard

Cinnabar Vapor Vent

A patch of cavern floor rich with cinnabar and elemental mercury reacts to the warmth of living creatures, erupting in a cloud of toxic, metallic steam.

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Hazard EntryEnvironmentalLevel4Simple

Cinnabar Vapor Vent

4LevelCommonRarityCavernEnvironment
EarthElementalEnvironmentalPoison
Level4
|
HP50
|
AC21
|
TypeEnvironmental
|
ComplexitySimple
|
RarityCommon

Defenses

AC21
Hard12
HP50
BT 25
Fort++14
Ref++8
Will++0
Immune
critical hits, object immunities, precision damage
Resist
fire 10
Weak
cold 5
EarthElementalEnvironmentalPoison

Detection

PerDC 22 (expert) to notice the subtle rhythmic pulsing of the vapor pools
StlDC 22 (trained)
InitNone

“The floor is streaked with brilliant, rust-red veins of cinnabar. A heavy, silver-tinted mist clings to the ground, shimmering with an unnatural, oily luster.”

Standard Engagement

Trigger

A creature enters the 10-foot-by-10-foot area of the cinnabar-streaked rocks.

Routine

None

Reset

The vent builds up pressure and resets after 1 hour.

Mercury Eruption

The hazard releases a burst of toxic mercury vapor in a 10-foot radius. Each creature in the area must attempt a DC 21 Fortitude save. Critical Success: The creature is unaffected. Success: The creature takes 2d8 poison damage. Failure: The creature takes 4d8 poison damage and is sickened 1. Critical Failure: The creature takes 8d8 poison damage and is sickened 2.

Lingering Fumes

After the initial eruption, the area becomes difficult terrain and provides concealment for 1 round as the heavy silver mist settles.

Description

A patch of cavern floor rich with cinnabar and elemental mercury reacts to the warmth of living creatures, erupting in a cloud of toxic, metallic steam.

Discovery

DC 22 Nature or Survival to identify the geological instability and the toxicity of the red mineral deposits.

Archival Lore

“These vents often form where the Plane of Earth intersects with volcanic veins, causing liquid metals to reach a volatile state.”

Environment
Cavern
Theme
Elemental
Creator
Natural Environment
Purpose
Natural geological process.
Game System
Pathfinder 2E
Art Style
Dramatic lighting with deep shadows, emphasizing the glowing red minerals and the reflective, mirror-like quality of the silver vapor.
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