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Call of Duty Cold War Zombies: Firebase Z Easter Egg WalkthroughFirebase Z will keep you here for the long haul, so strap in.
Firebase Z will keep you here for the long haul, so strap in.

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How to complete the Firebase Z easter egg
Turn the power on and get the Ray Rifle Wonder Weapon
In order to complete the easter egg, you’ll need the Firebase Z Wonder Weapon. We’ve put together a full guide onhow to obtain the Ray Rifle, but here’s a quick rundown if you just need a reminder:
This is an early step, but you might as well do it as soon as possible because the Ray Rifle is actually pretty damn good if you’re hitting headshots.
Talk to Ravenov and Peck
After assembling the Ray Rifle, go to the village and talk to Ravenov, just next to the Pack-A-Punch machine. When he’s said his piece, go to see Peck, who is behind a glass wall in the Mission Control room. When he’s done talking, go back to Ravenov and he’ll give you a keycard. Don’t worry - Peck is an absolute chatterbox, but at this point, zombies don’t seem to target you. How considerate of them.
Get truth serum
Take the keycard to a few places around the map. They’re big tall lockers with keypads on them. Make sure you grab the little bottles inside the lockers in the following locations:

Now, you need tohead over to the Field Hospitaland make the truth serum from the three compounds you’ve collected. To do this, interact with the table on the left side of the main door with all the tubes and gear on it. When you do this,hellhounds will spawn, so hold them off and then grab the serum.
Use the truth serum on Peck
Once you have the serum, go back to where Peck’s office is in Mission Control. Now, put the serum on the air conditioner above his office. This is quite tough to find, so starting from looking through Peck’s window:
Now it’s time for Peck to have another big long talking session. He’ll start talking and telling the truth and dancing. You have to wait this out, but zombies should stay away for the moment. Talk to him until he lets you know how to open the portal.

Trap Mimics using the Essence Trapper
This step is extremely finicky, I’ll be honest. What you have to do isgo to the Data Center and pick up an Essence Trapper. You get these from the memory machine over near Speed Cola.
However, it’s not that simple. You need three specific Mimics from three specific locations in order to get the codes for the quantum mainframe, as well as the dimensional tracker ID tag. In short, you need to trap Mimics that have spawned in the following locations:
In all honesty, when you’re fighting mountains of zombies, this stage is an absolute pain, but you’ll know you’ve got a correct Mimic memory upload when Weaver tells you. Also, the Mimics only have to have spawned in those locations, rather than be captured there. Once you have all three,a floppy disc will come out of the memory machine. Pick it up and go to thePlanning Office, interacting with the machine with all the screens.

Talk to Peck and Ravenov again
Go to Peck’s office and talk to him again. Then, head over to Ravenov and get the code for the Aethermetre locker. Don’t worry, you don’t have to memorise it, just go back to Peck and open the locker that’s just to the left of his door.
Now, head to Scorched Defense andpick up a shovel in the left bunker. You’ll need this to carry out the next step
Collect three Aetherium crystals
You’ll need to dig up three aetherium crystals now. They can be found in these locations:
Once you have the crystals, put one in each of the reactors you activated when turning the power on at the start of the game. You can then watch a cutscene at the OPC.
Final stage
You’re nearly done! After starting this stage, you’ll be thrust into a big boss battle, so don’t do it until you’re all perked up and ready.
Head to the Planning Office and interact with the computer. You’ll need to shoot downthe satellite with a question mark as its description.
That’s all for our Firebase Z easter egg guide! If you want a hand on the best loadouts to make it far in the easter egg, ourbest Zombies loadoutpage is all you need to help you out, and for more advice on other modes like multiplayer, we have guides to check up on, including thebest guns in Call of Duty Cold War.