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In Dalaran, you can find [item]44012[/item] around the sewers. The effects are varied but, one of them gives you a buff that says:

“You had always heard that this was “The City of Mages” but this is ridiculous!”

While riding around town, everyone looks like a Human Mage.

It does work while you are mounted and can be used all around Dalaran. When you leave Dalaran, you lose the buff.