Thin Air (PSR Supplement)

**PSR** is an alternate ruleset compatible with most 5e content.
System Differences The Basics Time The d20 Ability Check Ability Scores Strength Dexterity Constitution Knowledge Perception Charisma Saving Throws Skills Senses Carry Slots	Encounters Group Turns Round‑Table Turns Staggered Turns Your Turn Move Action Bonus Action Reaction Making an Attack Unarmed Strike Sunder Defense Cover Shifts Phases	Hit Points & Damage Temporary Hit Points Damage Types Max Damage Rest & Recovery Downtime Downtime Trading Downtime Enterprise Defeat Dramatic Death Common Hazards Extreme Climates Conditions	Items Goods & Currency Material Goods Weapons Improvised Attire Shields Tools Gear Attunement Objects Damaging Objects Hauling Objects Vehicles Artillery NPCs Mount Cohort Stat Blocks Vulnerability, Resistance, & Immunity

Thin Air

Thin air is an extreme climate. It can be difficult to breathe at high altitudes and in ventilation-deprived caves, among other locations.
At the end of each phase or shift you spend in thin air, there's a chance you must succeed on a mark 10 Grit save or lose a carry slot.
You needn't make this save if any of these apply:

You have no need to breathe.
You have a feature saying you can consistently hold your breath for 10 minutes or longer.
You camped this shift, or spent this phase taking a break.
You are acclimated to thin air.

Thin Air (PSR Supplement)

Thin Air

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