server/src/res/eressea/artrewards.xml

<?xml version="1.0"?>
<resources>

  <resource name="instantartsculpture">
    <function name="change" value="changeitem"/>
    <item weight="0">
      <function name="use" value="use_instantartsculpture"/>
    </item>
  </resource>

  <resource name="instantartacademy">
    <function name="change" value="changeitem"/>
    <item weight="0">
      <function name="use" value="use_instantartacademy"/>
    </item>
  </resource>

  <resource name="aurapotion50">
    <function name="change" value="changeitem"/>
    <item weight="0">
      <function name="use" value="use_aurapotion50"/>
    </item>
  </resource>

  <resource name="bagpipeoffear">
    <function name="change" value="changeitem"/>
    <item weight="0">
      <function name="use" value="use_bagpipeoffear"/>
    </item>
  </resource>

</resources>