The Friendly Klaus Easter Egg in Black Ops 7 Zombies Ashes of the Damned is part of the main quest. Even if you are not involved in the main quest, you can complete this particular Easter Egg to help you in round progression, as you can summon Klaus to assist you in battles. It will be present in your tactical equipment slot, so use the button dedicated to tactical equipment to summon Klaus.
This article will provide a detailed guide on completing the Friendly Klaus Easter Egg in Black Ops 7 Zombies: Ashes of the Damned.
How to complete the Friendly Klaus Easter Egg in Black Ops 7 Zombies Ashes of the Damned
First, you must follow the guided objectives and unlock the Pack-a-Punch machine in Black Ops 7 Zombies Ashes of the Damned. After that, you can follow these steps to complete the Friendly Klaus Easter Egg:
1) Progress to Round 8 and defeat the Uber Klaus

First progress to at least Round 8; the Uber Klaus will spawn only after that. However, to make it spawn, you must head to a particular location. Go to the Janus Tower POI and follow the west path. You will see a flipped-over truck just outside of the playable area to the right. As you pass that area, the Uber Klaus will spawn from there.
It will be a formidable enemy, so fight it from a distance. Once you defeat it, head to the location where it was eliminated, and you will find the Stabilizer Chip.
2) Locate Klaus

Klaus is held inside a cell in Ashwood. Head to Ashwood, near the Vulture Aid Perk-a-Cola machine. Just to the left of the machine is the Ashwood Sheriff's Office. Spend 500 Essence to unlock the door, and you will find Klaus inside a cell.
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3) Use the Stabilizer Chip

There will be a panel on the cell, so head there and install the Stabilizer Chip into the panel.
4) Use Stun Grenades to wake Klaus up

Gather four Stun Grenades. If you have collected them, that is good; if not, you can head to Vandorn Farm. There will be a Crafting Table you can use to craft Stun Grenades for 250 Salvage each.
Once you have the four Stun Grenades, head back to the Sheriff's Office and throw all four inside the cell in quick succession. This action will wake Klaus up, and it will fly out of the cell and land just outside the Sheriff's Office. Now you can use the dedicated button to command it to move wherever you want.
However, if it receives too much damage, it will go away. But there are radios present throughout the map, where you can use some Essence to call Klaus again.
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