There is a hidden secret in the Undead Campaign mission: Digging up the Dead. After killing Balador the Bright and his troops, use your Meat Wagons to destroy trees behind Balador's Barracks. Open a path into the river. Bring Arthas to the river. A concept art of the Pandaren by Samwise flashes briefly onscreen with the message: SECRET FOUND. Pandaren relaxation area.
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