The Mysterious Part D is a Key Item in Xenoblade Chronicles 2. It is needed for The Riddle on the Wall. It can be found in a buried Treasure Trove in the interior of the Isle of Sleeping Remains in the Leftherian Archipelago, as indicated by either the Indoline Murals or the Leftherian Murals. In order to reach it, a malign miasma must be clear by using the level 4 "Dark Mastery" and level 2 "Ancient Wisdom" Field Skills. The level 3 "Fortitude" and "Keen Eye" are required to excavate the chest, and the level 6 "Lock Picking" to open it.
Gallery[]
The entrance to the location of the Mysterious Part D treasure trove.
Approximate location on the map.