double_strike_2.xml

<abilities>
  <ability>
    <clone>double_strike</clone>
    <key>double_strike_2</key>
    <cooldown>8</cooldown>
    <unlockInfo>
      <autoDiscover>0</autoDiscover>
      <unlockRequirements>
        <requiredPoints>1</requiredPoints>
      </unlockRequirements>
      <replaces>double_strike</replaces>
    </unlockInfo>
  </ability>
</abilities>