Call of Duty: Black Ops 7 Guide | Harbinger of Doom – Dark Ops

Here’s how to complete the Harbinger of Doom Dark Ops challenge.

Game Guide by Joyramen on Nov 30, 2025

To complete the Harbinger of Doom Dark Ops Challenge in Call of Duty: Black Ops 7 Zombies, you'll need to reach 100 kills within a single scorestreak activation.

The best way of doing so is by utilising the ARC-XD. Utilizing the right equipment with the right setup, this challenge becomes pretty manageable, particularly in higher rounds.

Call of Duty: Black Ops 7, Harbinger of Doom – Dark Ops, PC, Screenshot, Gameplay, NoobFeed

Your best bet is to attempt the challenge when you are at around 20 or higher, since these rounds will have more zombies to reach their required 100 kills in a single activation. Higher rounds will work in your favor.

It also helps to enable the Rampage Inducer. This will cause zombies to spawn and respawn at a significantly higher rate, making it easier to take down a large crowd of zombies in a single round.

Call of Duty: Black Ops 7, Harbinger of Doom – Dark Ops, PC, Screenshot, Gameplay, NoobFeed

You should also utilize the Kill Joy Gobblegum, making it a lot faster to deal with armored zombies. Activating just before triggering the ARC-XD takes down a lot of the zombies instantly.

With this setup, during the round you plan on attempting this, you will want to group as many zombies as you can. Making sure everyone stays tight together. This can be done by running circles around them. When the horde gets large enough, pop the Gobblegum and then immediately use the ARC-XD.

You want to move the ARC-XD to the crowd slowly so that the blast damage can wipe out the zombies that are trailing it.

If everything is done accordingly, the 100 kill threshold should be reached without much of a hassle. Completing the Dark Ops requirement and unlocking the Harbinger of Doom.

This method remains one of the more efficient ways of completing the Harbinger of Doom Dark Ops challenge in Call of Duty: Black Ops 7 Zombies.

Also, check out our Call of Duty: Black Ops 7 Review, and other guides below: