This page of the guide to Resident Evil Village contains a walkthrough of the fifth puzzle in the House Beneviento dollhouse. The following guide explains how to escape the mutant fetus monster, where to find the fuses and how to safely bring them to the Breaker Box.
The previous puzzle with the 3 medallions is described on a separate page of this guide.
The puzzle in question begins shortly after finding the Breaker Box Key at the bottom of the Old Well. When you return to the previous location of Mia's large doll, you will only find an empty, bloody table.
You need to head to the Breaker Box, which, as a reminder, is located next to the elevator - the easiest way to find it is by following the blood trail.
A mutant fetus will prevent you from reaching the box and you will be forced to run away. It's worth making quick 180 degree turns here (by tilting the left analog stick down and pressing the Circle/B button on the pad).
You will have to take the long route to reach the Breaker Box, i.e. return to the room with the operating table, head to the room with the sink, and use the shortcut next to the Study.
Use the Breaker Box Key to open the Breaker Box. Inside, you will find the Relief of a Child statuette and you will realise that you need to find the fuse.
You must now reach the Mother's Door pictured in the above images, which is adjacent to the room with the sink. It's very likely that you will encounter the mutant fetus again on your way there. It will force you to retreat and take an alternative path.
Use the Relief of a Child statuette on the door to unlock a new passageway.
You can proceed to explore a whole new part of the basement. A linear path will lead you to the Bedroom, where you will find a box on the wall. Take the Fuse from it.
Set out to return, but expect the mutant fetus to suddenly appear soon after you go through the kitchen. You will have to start another escape preceded by a 180 degree turn.
Return to the bedroom and hide under the bed. Additionally, make sure that the entire character is hidden under the bed, that is, right in the middle of the space underneath it.
Lie hidden in wait for the mutant fetus to arrive and until it shuffles to the side of the bed farther away from the door.
Quickly crawl out from under the opposite side of the bed and begin your escape. Your goal, of course, is to reach the Breaker Box in order to place the fuse in it.
Note - It's easy to die at this point. After placing the fuse, stand with your back facing the elevator doors. Wait for it to arrive and don't react to the fetus when it appears.
Once the elevator doors open, quickly retreat (tilt the left analog stick down) and press the button to start the elevator. You should have enough time to close the door before the monster manages to approach the elevator and devour Ethan.