WARNING: The following contains spoilers for Resident Evil Village, available now.
Resident Evil Village tasks Ethan Winters with traversing a remote European village in order to locate his daughter Rose, and to defeat the four lords ruling the territory. After besting the challenge of The Stronghold, Ethan finally has the path to his goal laid out before him.
Resident Evil Village's story begins its final act as Ethan heads towards Heisenberg's Factory. With all four flasks containing the pieces of his daughter Rose, he has returned to the altar to begin his final struggle.
The Altar
After dealing with The Duke and using the save point, place each of the four flasks within the altar to obtain the Giant's Chalice. If you still have some side areas such as Otto's Mill or the Megamycete cave that you'd like to visit, do so now, as once you enter the Factory there is no turning back.
As the fires become lit along the path, follow it along the Lone Road towards the Ceremony Site. Upon reaching it, place the Giant's Chalice in the slot at the Site and the lift will automatically lower. At the bottom, walk outside to find a save point, and Heisenberg's Factory towering before you.
Entering The Factory
As you enter the newly opened gate, listen to Heisenberg, who kindly invites you inside for a chat. Don't worry, he assures you it isn't a trap. The grounds outside hide little of note, so approach the main doors and wait for them to open. When you're ready, head inside and follow the linear path. You will enter a room with a ragged sheet covering the wall, interact with it and Heisenberg will appear.
Heisenberg will explain his plan to you, and offer you a partnership. Ethan refuses. So, you are shoved down a hole in the floor, where you encounter the Sturm for the first time. This creature is completely unkillable for now, so you'll need to concentrate on running. Follow a linear path until you reach a garbage chute and jump in. After landing in the underground scrapyard, gather the resources in the area before climbing the ladder and dealing with Heisenberg's Haulers. At the end of the raised path, you'll need to remove the grate and crawl through the ventilation shaft to move on.
The Factory Floor
The factory's labyrinthine design will likely prove confusing, so remember to check your map as much as you need to. Turning to the right from where you're facing after exiting the vent, you should notice a door to the right which contains Heisenberg's labyrinth puzzle (remember this for later if you'd like to grab the treasure) and a large elevator on the left where The Duke has set up shop. He'll have some new weapons in stock, so be sure to browse. The save point here will be the only one in the Factory, so you'll be returning frequently. The elevator itself won't work - you'll need to turn the power on in order to activate it.
Straight ahead you'll see a set of double doors. Head inside after saving your game. You'll find a locked door in the next room with a glowing light, this is the lock. These locks appear semi-frequently within the factory and can be opened by using any weapon to smash the lights. As soon as this one is opened you'll be attacked by a couple of Haulers. A switch in the next room will reiterate that there is no power, so head down the stairs and kill the Haulers that exit the next room over, The Foundry, that contains a casting machine.
The Relief Mold
The casting machine is the key to traversing the area, you'll need to use it several times. To the right you'll see a wall with a depression, you'll need to find a mold to produce something to fit here. The other side of the room features a locked door and a stairway, take the stairs up and around to a group of Haulers. Kill them and note another door locked behind a switch that cannot be activated. The other door in the room is unlocked and leads to a very ominous-looking room with a mechanically augmented figure sat slumped in a chair. Head past him and open the case in the back to find the Relief Mold.
Predictably, the figure will awaken as you leave the room. The creature is a Soldat, and the factory contains many of them. They each have a glowing red weak spot on either their chest or back that must be fired upon but they will often protect it as they approach. Their drill arms are capable of dealing massive damage, so keep your distance. After killing or fleeing the Soldat, head back to The Foundry and place the Relief Mold in the casting machine. After a few seconds, it will produce the Relief of a Horse, which can be placed in the depression of the wall to reveal a secret passageway.
The Cog Mold
Take the secret passage and deal with the Hauler at the top of the stairs. A door ahead requires a specific key to unlock, make a note of it for later if you're looking for treasure. Take the ladder down into the engine room, when traversing it try to use the pistons to kill the various Haulers for you in order to conserve precious ammunition. After reaching the end of the room, climb the ladder up and remove the grate before crawling through the shaft. The next hallway contains various Soldats in stasis, don't worry, they won't attack you (yet). Make sure to unlock the door at the end which leads you back into The Foundry for later. Continuing on, a cracked wall with a yellow cross can be destroyed with a spare pipe bomb for some treasure on your way into the next room. The Generator here is missing a large cog.
Head down the nearby stairs and through the open gate marked with a green light. Unlock the room ahead and enter it. Inside, make sure to grab the Factory Map (Lower Levels) to make your life easier before opening the case and obtaining the Cog Mold. Unlocking the door at the end of the room provides a convenient route back to The Foundry. At this point, one of the dormant Soldats in the hall will attack. Deal with him and then use the casting machine to produce the Large Cog using the mold. Head back to the Generator and place the Large Cog, allowing you to pull the lever and reactivate the power.
Powering the Elevator
With the power on, listen to Heisenberg moan once again as you enter the newly opened gate in front of you. Be careful as a Soldat will drop from the assembly line behind you as you do, and a second will be walking the hall ahead. After killing them, explore the bottom floor of the large room ahead for ammunition and mines. Take note of the glowing electrical coils, as they can be shot to stun nearby enemies. Climb the stairs and head towards the next door with the glowing locks and deal with yet another Soldat. Lure it down to the electrical coils if need be. The next room over is another two-story one, the lower level swarming with Haulers. A side room behind a fence can be accessed by shooting the dormant Soldat behind it and allowing it to destroy the fence as he attacks, the room contains Lei and magnum rounds.
Head up the stairs when you're ready and keep walking until a shipping container is dropped housing a Soldat with two drills and a weak spot hidden on its back. Kill it and break the glowing locks on the next door to end up back in an earlier room that contains a switch that can now be pressed. A platform will slowly lower to bridge the gap between the switch and a door ahead. Head through the door and along the corridor until you encounter another Soldat with the two drills in a room with pillars, run around the pillars in order to get a good shot at the weak spot on its back. Break another set of glowing locks to open the door ahead and prepare to run.
Sturm will break through the wall and chase you down another linear path, run down it until you go through a door, saving you for now. Gather some supplies in the room before heading outside and pulling the lever on the side of the elevator shaft, this will call the elevator up to you, allowing you to take it between the current floor and the previous one. Head into the elevator to save and see The Duke if needed before climbing the nearby ladder.
Excavation Site
Follow the linear path and take the next ladder down into a concrete tube. Pass through it to reach an excavation site. The site is teeming with Haulers at work. Kill them and make your way forward to the room with the colossal drill. Take care of the Haulers in this room and grab the crystals by the base of the drill before heading through the small ventilation shaft at the back. After emerging from it, you'll need to climb down the nearby ladder and can turn around at the bottom to find another cracked wall that can be destroyed for a hidden treasure stash. Head forward into a massive room with a spinning engine above you, you'll need to disable it.
As you climb the stairs and ascend the room, look up for orange glowing spots that need to be destroyed to do so. Be careful, as you will be ambushed by Soldats as you climb, including armored ones that become invulnerable while guarding their weak spot. This armor can be destroyed with explosives, but you may be better off just being patient and accurate with hitting the weak point. With the engine disabled, head up and through the door. Move the cart and creep through the vent to grab the Ball Mold for the labyrinth puzzle if you so wish. Head up the stairs and into the Ventilation Duct, where you will start to be sucked into the fan's blades. Quickly shoot the glowing center of the fan to disable it and save yourself. Head through the debris of the fan and shimmy across the pipes, taking the ladder up and turning the crank to crawl through the newly opened gap. Take the lift ahead.
The Key Mold
The next room you come across will contain another case, this one containing the Key Mold. Grab it, and the ammunition in the room before continuing onwards through the double doors and up the ladder. You'll notice another locked door requiring a key ahead with the same symbols as the previous one. You'll need to use the Key Mold to create this key, so pull the nearby lever to access the elevator again. Save the game, take the elevator back to the bottom floor and make your way to The Foundry.
This floor is now shrouded in darkness and the path to The Foundry is swarming with Soldats, so maintain caution. When you arrive there, use the casting machine to create Heisenberg's Key using the Key Mold, and the Iron Horse Ball using the Ball Mold if you so wish. From here, feel free to explore the previously locked doors of the area, including those inaccessible due to a lack of power and the nearby room requiring Heisenberg's Key for ammo and treasure.
Make your way back to the elevator, dealing with Soldats along the way. The fully armored Soldat Panzer must have its armor removed via explosives before it can be damaged, so you'll have to run if you don't have any on hand. Back by the elevator, challenge the labyrinth puzzle now if you wish, as you won't get a chance to do so after continuing. When you're done exploring the Factory and feel prepared for a boss battle, take the elevator back up to the top floor and unlock the door with Heisenberg's Key. Head through the door and gather some supplies before continuing on.
Defeating Sturm
Sturm will charge through the wall when you reach a certain point, placing you in an arena with him. This time, the creature can and must be killed. As Sturm charges at you, he can tear down some of the walls of the arena, allowing you more room to maneuver. Like many of Heisenberg's other creations, Sturm has a weak point situated on his back. Explosives will hurt the beast, but this weak spot should be your target. As Sturm charges you, dodge and shoot at its weak spot as it hits a wall. Eventually, it will begin to overheat and shoot flames in a straight line ahead of it, this attack is a sign that you are weakening the monster. Keep laying into its weak spot until it finally falls. Gather the spoils of your battle and move on.
You'll need to jump down into the large room and walk across the crane to activate the switch. With the crane raised, you can disembark and head into the next room. Heisenberg himself will finally make an appearance. beginning to transform into a giant monster combined with metal. He will attack using his giant buzzsaw, launching you down through the floor and into the waters below. Remove the grate blocking your path and clear the debris afterward, to enter a darkened room where you'll be swiftly disarmed by Chris Redfield himself. Soon, you will need to do battle with Heisenberg, and deal with him once and for all.