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Most key items inConscriptserve to unlock access to a new area, then become unusable once their purpose has been fulfilled. However, the Lighter is a unique item that sticks around even after being used to unlock a door. Now, the power to ignite the battlefield rests in your hands, with a few exceptions.
Simply getting your hands on the Lighter isn’t enough, as you’ll also need to obtain some Lighter Fluid. Even after creating a functional Lighter, Fuel is needed to get a proper fire started. Here’s everything you need to know about the Lighter to finally start taking care of the rat problem.

How To Get The Lighter
Using the Trench Key, make your wayto the Reserve Trench East area.Head to the far east corner of the area toreach the Sleeping Quarters.Look out for thelantern burning outside the door, to ensure you’re going the right way.
In the northeast corner of the room,you’ll find a lockbox that requires a codeto be opened. The nearby diary entry suggestsentering Bernard’s birth yearas the code.

The dog tags on the table near the lamp reveal that Bernard enlisted in the year 1914, while the posters on the wall reveal thatBernard is 19 years old.This information reveals thatthe code for the lockbox is 1895.Open the box to retrieve the empty Lighter.
How To Get Lighter Fluid
Getting Lighter Fluid for the lighter first requires you tounlock the Coop Cage.Interact with the cage after opening it toobtain the lock pick.With the lock pick in tow, head east of the Pigeon Coop andenter the Mess Hall.
Use the lock pick tounlock the door directly north of the Mess Hall, opening access to the Fuel Storage Room. Here, you’ll find the Lighter Fluidon the shelf to the left.

How To Use The Lighter
The Lighter becomes functionalafter combining it with the Lighter Fluid.However, before you can light a fire,you’ll also need some Fuel.Fuel can be found lying around andcan be purchased from the Merchant.
Using Fuelwill lay down a patch of oilthat can be ignited with the Lighter. The flames areprimarily used to burn corpses, but they can also be used as traps for enemies giving chase.
The Lighter is also used toburn the rope on the door in the Emergency Control room, granting access to the Ruined Blockhouse. In this room, you’llfind the Supply Trench key.