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Keywords are:  'spellgroup warrior iron body skillgroup'

Warrior iron body:
 increased stamina                         13 war
   armored skin                            28 war
   second wind                             22 war
     indomitable will                      37 war
       last stand                          38 war
   iron claw                               25 war

These skills improve the core physical resistance of warriors, and allow
exhausted fighters to sometimes surpass their physical limits.