A creature can be Maimed for many reasons, such as taking a critical hit and failing the
Fortitude
Contesting Roll, or traveling too long, or staying awake on watch for longer than required.
In any case, when a creature is Maimed, it gains a stack of
Maimed. Each stack of
Maimed has -1 to all
Skill Rolls. Typically all creatures can be
Maimed. Once a creature reaches 10 stacks of
Maimed it is
Dead.
This status effect can be removed by a Long Rest,
Medicine,
Restoration, Adept, or
Restoration, Major.
Taking over half your Vitality in a single
Damage Roll automatically adds a stack of
Maimed.