Vacuum / Decompression

In hard Vacuum unsuited: hold breath CON rounds, then Fort saves vs ebullism (DC 15, 1d6/round + Sickened) and suffocation.

A character exposed to hard Vacuum -- a hull breach, an airlock failure, a suit puncture, or simply being pitched out an airlock -- is dying on two clocks. They can hold their breath for a number of rounds equal to their Constitution (minimum 2). Each round beyond that, they make a Fortitude save (DC 15) or take 1d6 damage as their body fluids begin to vaporize (ebullism) and gain the Sickened condition; failing by 5 or more drops them unconscious. After Constitution + 2 rounds without air, they suffocate and begin dying (see Bleeding (Unconscious at 0 HP)). A punctured suit loses its seal; the character or an adjacent ally can patch it with a Reflex save (DC 15) or a Mechanics check as a standard action. The only real fix is to re-pressurize or don a sealed suit. Constructs do not breathe and ignore the suffocation clock.

Rules Reference

Field	Value
Duration / Default Formula	until re-pressurized or sealed; ticks each round unsuited
Duration / Type	persistent
Onset / Trigger	exposure
Onset / Type	immediate
Prevented By	Sealed suit / vac-rated armour, Construct physiology (does not breathe)
Prevents	Speech, Sound-based communication
Save / Dc	15
Save / Interval	1 round
Save / Type	Fortitude
Stacking	replace
Category	hazard

Effect

description: After held-breath rounds: 1d6 ebullism damage per failed Fort save.

Field	Value
description	After held-breath rounds: 1d6 ebullism damage per failed Fort save.
modifier	-1d6
target	hp

description: Gains Sickened while exposed (body fluids vaporizing).

Field	Value
description	Gains Sickened while exposed (body fluids vaporizing).
modifier	sickened
target	condition

description: Fail by 5+ = unconscious.

Field	Value
description	Fail by 5+ = unconscious.
modifier	unconscious
target	condition

description: After CON + 2 rounds without air, suffocates and begins dying (COND-BLEEDING).

Field	Value
description	After CON + 2 rounds without air, suffocates and begins dying (COND-BLEEDING).
modifier	suffocate
target	condition

Mitigation

description: Sealed suit / vac-rated armour prevents exposure.

Field	Value
description	Sealed suit / vac-rated armour prevents exposure.

description: Patch a punctured suit with a Reflex save (DC 15) or Mechanics check.

Field	Value
description	Patch a punctured suit with a Reflex save (DC 15) or Mechanics check.

description: Re-pressurize the area or move into a pressurized compartment.

Field	Value
description	Re-pressurize the area or move into a pressurized compartment.

Severity Tiers

effect: Hold breath CON rounds, then Fort saves

Field	Value
effect	Hold breath CON rounds, then Fort saves
tier	partial

effect: 1d6 damage/round + Sickened, suffocation after CON+2 rounds

Field	Value
effect	1d6 damage/round + Sickened, suffocation after CON+2 rounds
tier	full