Quick answer: Use L Ctrl at the circular fitting in the Lady’s statue base. Soul hurls the Flying Guillotine into the fitting, revealing a square opening in the hall floor.
What you need
You need the Flying Guillotine. You get it for defeating Huangxing in this same hall. You don’t have to equip it. The Exploration Ability screen says so directly: “The Flying Guillotine can open special mechanisms placed by Huangxing even when not equipped.”

The Pillars of Kunlun quest also points you here, with the step “Use the Flying Guillotine to unlock the mechanism at the base of the Lady’s statue”.

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Where the open floor leads


A new story quest also appears here. THE WAY FORWARD asks you to “Enter the Mirage Estate”. That isn’t the lake you’re standing in. The Mirage Estate is a separate location.
How to get out of the Realm of Mirage


Inside the Puppet Cell, you’ll also find a portal leading back to the lake, a gate marked with an orange seal, and the burning ring that counts as the third door of The Herald’s Illusion.
Three glinting pickups sit on the Puppet Cell floor: Remnant Dust worth 22,376, Forged Otherworldly Copper, and Forbidden Camphor Timber.
On the Puppet Cell floor, beneath the hall at The Lady’s Shrine, you can find Forged Otherworldly Copper. Its card identifies it as the material for taking Martial-type Phantom Edges from Lv. 20 to max level.

Forbidden Camphor Timber is on the same Puppet Cell floor beneath the hall at The Lady’s Shrine. Its card lists it as the material that takes Ranged-type Phantom Edges from Lv. 20 to max level.







