Finding the Phantom Blade Zero Training Grounds Key took me ages, all because I missed a dirt path in the main Mandate camp that leads to the dovecote and, eventually, the boss that holds the key. It's also a very good idea to find it as you won’t be able to finish repairing the Illusory Pipa without it – and you'll miss out on some other rewards too. Anyway, I've explained exactly how you find the Training Grounds Key in Phantom Blade Zero below, so that you can wrap up the Mandate Encampment region and crack on with the main quest.
The Training Grounds Key is a reward for defeating the Chief Disciple of the Seven-Stars Formation boss fight in the middle of the Mandate Encampment. However, the critical path you need to take to reach this boss can be easily missed:
With the Chief Disciple boss defeated, the Mandate Encampment's Training Grounds Key will be yours – and the Phantom Blade Zero Moji's House Key is also just ahead! Now you just need to make your way to the Training Grounds door and interact with it to get it open. I won't spoil what's on the other side besides another boss fight, which rewards you with the flashy dual-wield Baishan Stormswords and the Broken Vessel Accessory (it doesn't quite make it onto my list of the best Phantom Blade Zero Accessories , unfortunately). Crucially though, you'll also find the backplate of the Illusory Pipa, which puts you one step closer to being able to take this mystical musical instrument to Myst in Pangzhen for repairs.
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