Steal another game's item, put it in WoW.

OP, lore crushing, whatever it may be. Take an awesome item from another game, rename it, adjust it, and put it in WoW.

Magical Mirror from Zelda: A Link To The Past
Gazing into the mirror causes the sands of time to stir around you, teleporting you from present day to the same location before the War of the Ancients. Gazing into the mirror again teleports you back.