• Rune of Opening
• Item Level 1Disenchants into:
  Not disenchantable
• Use: Opens certain Dalaran-sealed containers.
• 1 Charges

Source

This item drops from Dalaran Summoner in Alterac Mountains. They open Hidden Strongboxes which can be found in the same area.

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB