Collecting Moji's House Key in Phantom Blade Zero is quite easy as it's right at the end of a path, in the middle of the Mandate Encampment, making it near enough impossible to miss. The problem is the beginning of that path can be easily missed and there's also a two-phase boss fight near the end that can be quite gnarly if you're not prepared. I'll admit that the rewards in Moji's house aren't great, but you may as well break in if you've gone through all this effort to get the key. With that, here's exactly how you find Moji's House Key.
Moji's House Key is found upstream just after defeating the Chief Disciple of the Seven-Stars Formation boss. Since defeating this boss is also how you get the Phantom Blade Zero Training Grounds Key, the route to Moji's House Key is exactly the same, so here's where you go:
So now that you've finally got Moji's House Key, you can return to Moji's house and loot what lies within… which is unfortunately not very much. I found some Universal Solvent and all six pages of the Moji's Final Letter book, which tells you a bit about this Mandate master. You at least get Remnant Dust for each page, and the final one is a map that highlights the mountain path on the northeastern side of Lake Meigu. If you're yet to explore the lake, take this as a hint on where to go.
Follow the directions of Moji's map and you can finally complete the Phantom Blade Zero Whence The Weeping quest, as well as several others.
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