The Four Fierce Axes quest is likely the second you'll acquire in Phantom Blade Zero, after Flesh Lily, when you find a "Four Axes" case file in the Broken Puppet Valley early on.

You'll have to "uncover the truth behind the Four Axes Rebellion" which involves continuing to the outpost and defeating the Peng Meng boss there. After that, you'll have to "gather evidence of the conspiracy against the Four Axes", which means finding seven more "Four Axes" case files in Weeping Creek Valley, besides the one you already have and one Peng Meng drops. Here's where they all are:

Thankfully, all of these locations are marked on your map, which makes things easier. "Hang on, that's only six out of seven, though" you may be thinking.

To get the seventh case file, you need to progress to the Village of Lu region after the Crimson Forest. You'll get the Leave None Alive quest, which directs you to head back to the outpost, and upon arriving, you'll find you're now able to get past the barrier to the location of the final case file.

Simply head into the area with the houses, up into the Lady's Cave, follow it through and outside, where you can use the Hunter's Sickles to reach the platform with the last case file.

The final step of this quest is bringing all the evidence to the Child of Insight in Pangzhen, the game's 4th region. You'll have to progress through the Village of Lu area to reach Pangzhen, then a little way into the town itself—thankfully, you'll also have a map marker for this, so it's straightforward enough.

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