message: Reduced Light Swordsman cost
diff: <BonusType>BONUS_COPPER</BonusType>
  <BonusType>BONUS_IRON</BonusType>
  </PrereqBonuses>
  - <iCost>35</iCost>
  + <iCost>30</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <iMinAreaSize>-1</iMinAreaSize>
  <iMoves>1</iMoves>
  <BonusType>BONUS_COPPER</BonusType>
  <BonusType>BONUS_IRON</BonusType>
  </PrereqBonuses>
  - <iCost>35</iCost>
  + <iCost>30</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <iMinAreaSize>-1</iMinAreaSize>
  <iMoves>1</iMoves>
  <BonusType>BONUS_COPPER</BonusType>
  <BonusType>BONUS_IRON</BonusType>
  </PrereqBonuses>
  - <iCost>35</iCost>
  + <iCost>30</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <iMinAreaSize>-1</iMinAreaSize>
  <iMoves>1</iMoves>
  