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Keywords are:  'warrior skill second wind'

Skill: second wind              Lvl 22 Warr  (28%)
                                (critical)   Requires: increased stamina
                                Group: Warrior iron body

Warriors who train for endurance often discover that they can occasionally
enter into a state where they may temporarily overcome exhaustion.  Known
as a 'second wind', this has enabled many a legendary fighter to persevere
to the end to overcome huge obstacles and perform legendary feats.  This
skill allows one to intentionally tap into that reservoir, though the limits
of the body do not allow it to be done often.

The 'second wind' skill can be learned by mid level warriors with knowledge
of 'increased stamina'.