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Keywords are:  'warrior skill armored skin'

Skill: armored skin             Lvl 28 Warr  (21%)
                                (critical)   Requires: increased stamina
                                Group: Warrior iron body

Warriors trained in the 'armored skin' skill have honed and toughened
their bodies to be more resistant to harm. They gain permanent passive
resistance to breath and normal damage.

The amount of resistance gained is not high, but it stacks with other
defensive spells and skills.