One of the Ally missions for Sofia Daguerre will require that you retrieve Serum Z from the West Tex Research Center and bring it to her. This mission is fairly straightforward but in case you’re struggling, you can read our guide below.
In this guide, we will give you a complete walkthrough of the Past Expiration quest in Fallout 76 including what you need to do to get started and how to complete it.
How to Start Past Expiration in Fallout 76?
This mission becomes available once you complete Daguerre’s previous companion mission; Boot Camp. You will get the prompt automatically and once the Past Expiration mission starts in Fallout 76, you will have to speak to her. She’ll ask you if you’re with her on this.
You will have to select the first option where you promise her you’re with her on this, and she will ask you to call her Sofia.
The next options you’ll need to select are: “I’ll find this serum, won’t take long” And “I’ll be back later, Sofia”. You can also select other options to see how she reacts to everything you say, but neither of your other options will allow the conversation to proceed.
Where to find Serum Z in Fallout 76?
Open your map and fast-travel to the National Radio Astronomy Research Center. Once you’re here, head towards the facility on the map with the Retrieve Serum Z highlighted.
Once you’re here, you will run into several hostile units who’ll begin to shoot at you. Try and kite them out of the facility and put them down individually.
Try taking down the ranged enemies first since they’ll be very annoying. After you’ve cleared the enemies, head to the door of the West Tex Research Center and enter the facility.
Go straight and proceed to the terminal here. Open the door on its right using the terminal and head inside. You will run into several Super Mutant Masters here.
Proceed further while fighting off the enemies that you encounter. You will enter a kitchen-like area with several cabinets and counters.
The cabinet will have Serum Z in it. Take it and leave. Once you go back to Sofia to bring the Serum Z to her, complete the conversation with her after you interact with her, and you will have completed the mission.
