Extreme Cold
DC 10 CON save each hour or gain exhaustion. Cold weather gear or cold resistance = auto-success. Frigid water requires immediate saves.
Temperatures at or below 0°F (-18°C) expose creatures to the risk of hypothermia and frostbite.
Saving throws: A creature exposed to extreme cold must make a DC 10 Constitution saving throw at the end of each hour.
On failure: The creature gains one level of exhaustion.
Automatic success:
- Creatures with resistance or immunity to cold damage automatically succeed.
- Creatures wearing cold weather gear (thick coats, fur, insulated clothing) automatically succeed.
- Creatures naturally adapted to cold environments succeed automatically.
Frigid water: A creature that falls into frigid water (below 40°F/4°C) must make a DC 10 Constitution saving throw. On failure, the creature gains one level of exhaustion. For each minute spent in frigid water, the creature must repeat the save.
Getting wet in cold: A creature that gets wet in extreme cold conditions is at greater risk. The DM may impose disadvantage on the Constitution save or increase the DC.
Frostbite (DM option): After extended exposure, the DM may rule that a creature suffers frostbite, which could reduce Dexterity, damage extremities, or impose other penalties.
Mitigation:
- Cold weather gear (10 gp) prevents the need for saves
- Endure elements or protection from energy (cold) eliminates the hazard
- Shelter from wind and cold reduces exposure
- Create bonfire or other fire-creating spells provide warmth