The Staff of Twin Worlds

The Staff of Twin Worlds is quite a popular item, often seen with magic-wielding adventurers new to Outland.

Source
This item is a quest reward from the following quests:
 * The Path of Anguish (quest)
 * Felspark Ravine (quest)

Trivia

 * The Staff of Twin Worlds is an Epic Weapon card in the World of Warcraft: Trading Card Game's Drums of War set.