ironclad_defense_3.xml

<abilities>
  <ability>
    <clone>ironclad_defense</clone>
    <key>ironclad_defense_3</key>
    <cost>10.0</cost>
    <cooldown>20</cooldown>
    <unlockInfo>
      <autoDiscover>0</autoDiscover>
      <unlockRequirements>
        <requiredLevel>10</requiredLevel>
        <requiredPoints>2</requiredPoints>
      </unlockRequirements>
      <replaces>ironclad_defense_2</replaces>
    </unlockInfo>
  </ability>
</abilities>