Extreme Climates (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

Venturing for hours through inhospitable climates can test a creature’s mettle in ways encounters might not. At the end of each phase or shift, there's a chance you need to make a saving throw against the climate you're enduring. See the "danger d6" rules in phases or shifts. When time is broken into phases, the area tends to be more dangerous and protags are under much greater stress, reflected in these saves occurring much more often than in shifts.

Typically when this save is a mark 10 Grit save, and on a failure you lose a carry slot. Different circumstances about different climates are detailed below, though your campaign may feature other climates.

Acclimation. If a creature is “acclimated” to any extreme climate, it never needs to make saves for working in that climate. Creatures encountered in that climate are almost always acclimated to it.

Becoming Acclimated? Some features may specifically grant you acclimation. Otherwise, your narrator decides whether protags can acclimate to an environment or not. Realistic acclimation would take a month or more, if it’s even possible at all.

Extreme Cold

This includes temperatures well below freezing, such as 0°F or -20°C.
At the end of each phase or shift you spend in extreme heat, 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 the following apply:

You are wearing appropriate cold weather attire.
You have resistance or immunity to cold damage.

Extreme Heat

This includes sweltering temperatures, such as above 100°F or 40°C.
At the end of each phase or shift you spend in extreme heat, 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 the following apply:

You were Soaked for at least part of this period.
You have resistance or immunity to fire damage.

Miasma

Miasma is an area of patchy foul-colored fog filled, often with flying insects. It is particularly common in swamps or polluted urban areas, and in some cases it can stretch for miles.
At the end of each phase or shift you spend in miasma, there's a chance you must succeed on a mark 10 Grit save or become Poisoned until you either finish a shift of camping or a day of downtime. If already Poisoned this way when you fail this save, you instead lose a carry slot.
You needn't make this save if any of these apply:

You have resistance or immunity to poison damage, or to the Poisoned condition.
You have no need to breathe.

Thin Air

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.

This work includes material taken from the System Reference Document 5.1 (“SRD 5.1”) by Wizards of the Coast LLC and available at .

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