Effects of Heat
Note that spells such as Endure Heat or Resist Heat can reduce or eliminate the effects of normal extremes of heat. The Endure Heat and Endure Cold talents can also reduce the effective temperature.
| Temperature | END Usage | NL Exertion Cost | Lethal Damage | Other |
| 101 to 110 | x1.5 | 1d4 | 0 |  |
| 111 to 120 | x2 | 2d4 | 1 point per hour | |
| 121 to 130 | x2.5 | 2d6 | 1 point per 30 minutes | Half strength Heat Armor but all NL damage |
| 131 to 140 | x3 | 3d6 | 1 point per 10 minutes | Heat Armor but all NL damage |
| 141 to 150 | x4 | 4d6 | 1 point per minute | x1.5 effect Heat Armor, 33% is lethal |
| 151 to 160 | x5 | 5d6 | 1 point per round | x2 effect Heat Armor, 50% is lethal |
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Temperature - in Fahrenheit
END Usage - If you spend NL damage for anything, apply this modifier. For example, if you hit extra hard and take 3d2 NL damage, multiply the result of the 3d2 roll by 1.5 if the temperature is between 101 and 110 degrees.
NL Exertion Cost - If you are exerting yourself physically, take this amount of NL damage each round. For example, if you are in melee combat in 125 degree temperatures, take 2d6 NL damage each round.
Lethal Damage - Take this much lethal damage in the given temperature. Collapsing due to this damage is synonymous with a heat stroke. Double this if wearing full armor (anything other than a leather jerkin).
Other - At very hot temperatures, the effect is similar to the cleric spell Heat Armor except that it applies to all armor except leather jerkin.
Effects of Cold
Everyone has a comfort range that is determined by their CON. This comfort range assumes that the character is being active. If they are resting, the comfort range increases by 15 degrees. For example, someone with a CON of 15 is comfortable in light clothing down to 50 degrees. However, it they want to rest or sleep, the comfort range becomes 65 degrees. If the temperature is, for example, 60 degrees, they will not sleep well without additional cold protection, such as a blanket.
| Temperature offset | Effects |
| Down to comfort range | No ill effects |
| From comfort range to 15 degrees below comfort range | Feels cold. -5 to all activity and skill rolls. This penalty goes away on the 3rd round of combat as the character warms up. Rests fitfully. Half normal healing and spell point recovery from sleep. |
| -15 to -25 degrees below comfort range | -10 to all activity and skill rolls. This drops to -5 on the 3rd round of combat and -0 on the 5th round. Quarter normal healing and spell point recovery (round down) from sleep. |
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