$(".desccontent").show();
$(".desccontent").hide();

    $('.buildorderbox').click(function(){
    $(this).children(".desccontent").slideToggle();
    });

<div id="protoss">
  <div class="columnLeft" style="width: 350px; float:left">
    <div class="buildorderbox"></div>
    <div class="buildorderbox"></div>
  </div>
  <div class="columnRight" style="width: 350px; float:left">
    <div class="buildorderbox"></div>
    <div class="buildorderbox"></div>
  </div>
</div>