Maxium Target Level 85
"This scroll will unlock am additional 10 item levels when used on a Legendary Item with a minimum level to equip of 79 or less. Only one Scroll of Delving can be used on each Legendary Item."
You can win this item from the Lottery: Lottery of the Devout and/or Lottery of Angrenost of which you can enter at http://my.lotro.com/home/lottery.