Bath'rah's Parchment

Bath'rah's Parchment is a list of materials needed by Bath'rah the Windwatcher in order to summon the great air elemental Cyclonian. If a warrior can defeat Cyclonian, Bath'rah can take his heart and build a weapon around it.

Source
This item is provided by accepting the warrior quest Cyclonian (quest). This quest is part of the Whirlwind Weapon quest chain for warriors.