Fatigue and Hypothermia

Fatigue is measured in six levels. An effect can give a creature one or more levels of exhaustion, as specified in its description. Effects are cumulative.

1. Disadvantage on DC rolls
2. Speed halved, -2 to PER checks
3. Disadvantage on attack rolls and saving throws (Luck)
4. Hit point maximum halved
5. Speed reduced to zero
6. Death

Reaching Level 3 fatigue due to Spellburn adds the effects of Hypothermia:
A character can become subject to hypothermia after one turn of being submerged in an underground body of water, OR being in wet clothing for one hour, OR attempting to sleep (or lying unconscious) on bare stone for two hours. Fatigue of Level Three or higher, brought on by spellcasting, will cause hypothermia.
After hypothermia sets in, make a CON check, failure means the loss of 1d6 HP. This check is then repeated every turn with HP losses accumulating until the character reaches an alternate heat source, gets dry clothing and a source of warmth, or loses consciousness at 0 HP. Save vs Death every turn thereafter, where failure means cardiac arrest and death.
Getting dry and warming up returns 1d6 HP (lost due to cold) every turn.
Smearing a thick layer of grease on one’s body before entering subterranean water will allow for two turns unaffected in the water.

Type

Physiological