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The Blood Guard's Shield was only available as potential loot during the special pre-Mists of Pandaria expansion event, Theramore's Downfall (scenario). This was the level 85 version and should not be confused with the level 90 version currently available in MoP.

It is a shield that is elegantly simple and -cough- to the point. Those desiring this model and color for transmogrification can pick up a look-alike via the Maraudon dungeon quest, Princess Theradras. Choose  Shield of Maraudon as the reward.