For five turns <a href="http://pldh.net/dex/move/special" class="linksred">Special</a> damage is reduced to 50%.  The hold item Light Clay can extend this effect from 5 to 8 turns. The move <a href="http://pldh.net/dex/move/brickbreak" class="linksred">Brick Break</a> can end this effect as well as the move <a href="http://pldh.net/dex/move/defog" class="linksred">Defog</a>.