As characters take damage, the loss of
blood and general trauma render them less effective in combat.
Any character reduced to 50% or less of their maximum hit points is
considered fatigued. Fatigued characters take -2 to strength and
dexterity, and can neither run or charge. Any character reduced
to 25% or less of their maximum hit points is considered
exhausted. Exhausted characters take -6 to strength and
dexterity, cannot run or charge, and move at half normal speed.
Characters in a rage may make a DC 10 fortitude save to ignore the
effects of fatigue, The DC increases by 1 for each round the
character would be fatigued. Similar checks may be made to ignore
the effects of exhaustion, with the DC equal to 20, +1 for each round
the character would be fatigued or exhausted.
Damage-induced fatiguer and exhaustion may only be removed through
healing the character above the hit point threshold that triggers these
effects.
Damage induced fatigue stacks with other forms of fatigue. Thus,
if a character who is already fatigued drops to 50% of their maximum
hit points, they are considered exhausted. There is no additional
penalty is the character drops to 25% of their maximum hit points or
less.
Constructs, undead, and other creatures are immune to the effects of
fatigue and exhaustion. At the DM's discretion, however, they may
be subject to similar effects representing the effect of the structural
damage they have suffered.