1. Core Principle
Cold is not damage.
Cold is attrition plus decision pressure.
Exposure:
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penalizes performance
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escalates quickly
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kills only if ignored
This keeps winter dangerous without turning every hour into a saving throw slog.
2. Hypothermia (GFN Core, OSE-Friendly)
Trigger:
The referee calls for a hypothermia save when:
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traveling without adequate gear
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resting without shelter or heat
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during storms or severe wind
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after getting wet in cold conditions
Save: Save vs. Paralysis
Failure moves the character one step down the hypothermia track.
Hypothermia Track (unchanged, GFN)
| Stage | Condition | Mechanical Effect |
|---|---|---|
| 1 | Mild | –1 to attack rolls and saves |
| 2 | Moderate | –2 to attack rolls and saves |
| 3 | Severe | –3 to attack rolls and saves, confusion |
| 4 | Apparent Death | Comatose; death imminent |
Severe Hypothermia Confusion (GFN)
Roll 1d6 each hour:
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Burrows into snow or debris
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Begins undressing
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Incoherent, cannot communicate or cast
4–6. Acts normally
Apparent Death
If not warmed:
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Death occurs in 6 turns minus temperature level
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Severe cold kills fast
This is excellent as-is. Keep it.
3. Temperature Levels (Simplified Use)
You already have five temperature levels. The key improvement is how often saves are called, not tracking every hour obsessively.
Temperature Levels
| Level | Descriptor | Save Frequency (No Proper Gear) |
|---|---|---|
| 1 | Mild | None |
| 2 | Cold | 1 per day |
| 3 | Very Cold | 1 per watch |
| 4 | Severe Cold | 1 per hour |
| 5 | Extreme Cold | 1 per turn |
Proper gear pushes the save frequency one step slower.
Extreme gear may negate saves entirely unless worsened by weather.
4. Getting Wet (Keep This Rule)
This is one of the most important rules in GFN.
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If a character gets wet in Cold or worse:
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cold gear becomes ineffective
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treat temperature as one level worse
-
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Drying requires:
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shelter + heat
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or a full watch in a protected location
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This rule makes rivers, snowmelt, storms, and falling through ice terrifying without adding math.
5. Climate Zones (Use as Modifiers, Not Maps)
Rather than track zones constantly, use them as background pressure.
| Zone | Effect |
|---|---|
| Boreal | No modifier |
| Tundra | –1 temperature level; –2 to hypothermia saves |
| Polar | –2 temperature levels; –4 to hypothermia saves |
This stacks cleanly with weather and time of day.
6. Weather Conditions (Streamlined)
Use weather to change visibility, navigation, and risk, not damage.
Common Effects
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Fog / Snow: visibility to encounter range
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Storm / Blizzard: half visibility, navigation checks worsen
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Wind / Gale: missile penalties, shelter stress
Blizzards are where:
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sled teams matter
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retainers matter
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bad decisions become lethal
7. Weather Generation (Referee-Light)
Instead of rolling every sub-table every day, use this:
Daily Winter Weather (1d6)
| Roll | Result |
|---|---|
| 1–2 | Clear or Clouded |
| 3 | Snow |
| 4 | Wind + Snow |
| 5 | Storm |
| 6 | Blizzard |
Then apply:
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Day/Night temperature shift from your seasonal tables
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Zone modifiers
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Wind level only if it matters tactically
This keeps the feel of GFN without bogging play.
8. How This Integrates with Your Stages
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Stage 1 parties fear every night
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Stage 2 parties manage exposure and fatigue
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Stage 3 parties can operate through storms
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Stage 4 parties treat weather as timing pressure, not a stop sign
Cold never stops being relevant.
It just stops being the main antagonist.
9. Referee Rule of Thumb
If players ask:
“Do we need to roll for hypothermia?”
Ask instead:
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Are they wet?
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Are they exposed?
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Are they pushing time?
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Did they cheap out on gear?
If yes → roll.
If no → let the cold loom quietly.
10. Why This Works
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Keeps GFN’s brutality
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Respects OSE pacing
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Rewards logistics, sled teams, and retainers
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Makes winter a system, not a tax
If you want next, I can:
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condense this into a one-page referee winter sheet
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build a storm escalation table
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or write a player-facing “Winter Kills the Careless” sidebar