How to build the RAI K-84 wonder weapon in Firebase Z in Call of Duty: Black Ops Cold War

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Call of Duty: Black Ops Cold War’s Zombie mode always makes a point to include enough powerful off-the-wall features for you to fight off the hordes of undead. Of the most iconic features are wonder weapons, the guns unique from all other weapons with their effects.

In Firebase Z, the wonder weapon is called the RAI K-84 Prototype and is a powerful tool to have in your arsenal. It has two firing modes; the first puts out beams that disintegrate enemies, while the second will slow and damage anyone walking through its area-of-effect. If you want to get your hands on the RAI-K84, you can get it in the mystery box or from the trial rewards, but there are steps you can go through to get one for free. Here is how to build the Firebase Z wonder weapon, the RAI K-84.

First, you need to turn on the power and activate the pack-a-punch machine. We have already covered this in another guide, so if you need help, be sure to check that out and come back here.

After power is on, go to the Weapon Lab from Motor Pool and grab the blueprint hanging on the wall. From here, make your way to Scorched Defense beyond Mission Control and find the charred body leaning against a tank on the right side path. Interact with it, and you will tear his eye out with your knife. When you do this, he will come alive, and in the animation, you will stab him in the head. When this is done, a batch of slow-moving zombies will pop out of the ground around him. There is nothing special about these guys; just kill them.

With the eye in your inventory, go back to Weapon Lab and interact with the computer to the right of where you grabbed the blueprint. It should say, “PROVE YOU ARE