The Mandate Encampment Outer Gate Key is one of the most important to find in Phantom Blade Zero, since it unlocks an entire region that's otherwise inaccessible.
Though you find the gate to the Mandate Encampment when you first arrive in the Village of Lu, the key is actually towards the end of the Pangzhen area (the game's 4th region), which you visit in its second chapter.
Exploring the west sid...
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