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This are the first tier of Cataclysm tokens curiously only the headpiece and shoulders can be bought using tokens everything else is bought from points.
Dropped by Cho'gall in Bastion of Twilight Normal
Why and/or when would Cho'gall drop The Mantle of the Forlorn Conqueror -- iLvl 359 gear -- instead of Shoulders of the Forlorn Conqueror, which is iLvl 372 gear?
As of 6.02 this cannot be traded for the relevant piece of gear. Instead if you want it you can buy it for 71G.