Mor Ardain Murals is an Info Item in Xenoblade Chronicles 2. They can be obtained by examining the mural in the very southwest of Alba Cavanich in the Empire of Mor Ardain, on the lower side next to the bridge to the palace. Accessing said mural involves jumping across buildings, then jumping down to a platform that sticks out of the outer wall pointing towards the western wing of the palace. They hint at the location of the Mysterious Part B.
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Mor Ardain Mural Location