achilles_bane_2.xml

<abilities>
  <ability>
    <clone>achilles_bane</clone>
    <key>achilles_bane_2</key>
    <description>
      Fire a bolt with +15 accuracy but ⮃-15% damage⮃.
      [p]Immobilizes the target for 3 turns on hit.
    </description>
    <type>Target</type>
    <cooldown>7</cooldown>
    <unlockInfo>
      <autoDiscover>0</autoDiscover>
      <unlockRequirements>
        <requiredPoints>1</requiredPoints>
      </unlockRequirements>
      <replaces>achilles_bane</replaces>
    </unlockInfo>
    <attacks>
      <attacks>
        <count>0</count>
        <modifiers>
          <modifiers>
            <type>Accuracy</type>
            <amount>15.0</amount>
          </modifiers>
          <modifiers>
            <type>Damage</type>
            <amount>-0.15</amount>
          </modifiers>
        </modifiers>
        <debuffs>
          <debuffs>
            <reference>immobilized</reference>
          </debuffs>
        </debuffs>
      </attacks>
    </attacks>
  </ability>
</abilities>