gistfile1.rb

def do_damage(options={})
  actual_damage = self.attacker.jitter_damage
  actual_damage *= 2 if options[:crit]

  # damage reduction
  self.damage = (actual_damage * (1.00 - normalize(self.armor * 0.001)))).round

  self.defender.health -= self.damage
end

def normalize(power)
  power / (1.0+(@character.level-1)*0.10) 
end