Scepter of Celebras

Scepter of Celebras was once used as a key item, enabling the player to access a portal to the midway point of the Maraudon instance. The "Use" tooltip read: "Creates a portal, teleporting group members that use it to Earth Song Falls in inner Maraudon."

Source
This item is a quest reward from The Scepter of Celebras (quest).

Use
You could only use this item at the location of the first khan in the Maraudon pre-instance area.