The lights go out again, but this time they don't come back on. You cast Lumos to light up your surroundings. You turn around and see a group of three mannequins at the end of the hallway. However, they quickly disappear as the lights above them flicker on and off.
If you keep going north down the hallway you'll reach a dead end. If you turn south you'll also reach a dead end. If you keep turning, looking for an exit, the walls will seem to close in and you'll be trapped. The only way out is to cast the Lumos spell again or use a basic spell to dispel the spell and break it.
The lights will go dark, but you'll notice the outline of a mannequin nearby, cast Lumos to light up the area and reveal all of the mannequins around.
Attack the mannequins if you like, and once you've cleared the area you'll find yourself back in the room you started in, this time with only one of the three doors remaining.
Enter the door and follow the hallway to the final room. There is a single table in the middle with a small wooden mannequin and a Jack-in-the-Box toy on it. Interact with the Jack-in-the-Box to proceed.
The lights will go out and you will find yourself in the final section of the maze. Cast Lumos to provide a light source and you will find mannequins scattered throughout the many corridors. As you wander around the area, the mannequins will come to life and become enemies that must be defeated. Luckily, there are many ways to defeat them as the mannequins can be easily destroyed with many spells.
Once you've killed the last mannequin, the light will flash. Continue through the empty maze to the open door to the east. Enter the next area, turn left and head north. Once you've made it out of the mannequin maze, you'll find another lantern as your reward.