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Elixir of Ancient Knowledge
Binds to Battle.net account
Item level 1
Use: Increases experience gain by 300% for 1 hour.
Does not work for players above level 84.
"A faint whispering can be heard from the bottle."

http://mop.wowhead.com/item=86574

"Drops from Krol the Blade (a rare elite in Dread Wastes), lvl 90 with 4 million hp."
"In the latest patch this item is now bound to account so sadly there will no longer be a market for it on the AH."