Leftherian Murals is an Info Item in Xenoblade Chronicles 2. It hints at the location of the Mysterious Part D. It can be obtained by examining the mural to the west of Corinne's House on Fonsett Island in the Leftherian Archipelago. The level 3 "Keen Eye" and "Ancient Wisdom" Field Skills are required to be able to read the mural.
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Leftherian Mural Location