U4GM How to complete the Harbinger of Doom in Black Ops 7

 I kept hearing the Harbinger of Doom Dark Ops ask was “easy” until I tried it myself and watched every scorestreak fizzle out around 40–60 kills. If you’re testing setups or just want cleaner reps for this kind of thing, a CoD BO7 Bot Lobby can help you get comfortable with the timing, because this challenge is way more about rhythm than raw firepower.




1) Wait for the right round

Don’t force it early. You need the map to be spitting out enough bodies that you won’t run dry mid-streak. I start thinking about it around Round 20. Earlier than that, the spawn pace just can’t keep up, and you end up driving around with nothing to kill.

2) Turn the match into a factory

If you’ve got access to the Rampage Inducer, switch it on. Yeah, it’s sweaty. They sprint, they stack, they refill quicker. That’s the point. For this one, you don’t want “manageable.” You want nonstop. It’s basically converting the round into a conveyor belt of targets.

3) Build a proper train

This is where people get impatient. Spend a minute doing nothing but herding. Wide loops, clean corners, no random shots. If you start thinning the group, you’re stealing kills from your streak. Keep them glued together until it feels like half the map is behind you.

4) Bring the real cheat code

The key piece is Kill Joy. Armored zombies are time thieves, especially when you’re trying to squeeze 100 kills out of one activation. Pop the gum, grab the Instakill, and be ready to commit immediately. If you hesitate, you waste the best seconds.

5) Use the ARC-XD the “wrong” way

Here’s the part that sounds backwards: don’t ram the horde and blow up. Deploy the ARC-XD and drive it slowly alongside your train. Let the pulse damage do the work. With Instakill up, those pulses erase zombies as they step into range, while fresh spawns jog right into the same meat grinder.

6) Keep it alive long enough

Think of it like mowing a lawn. Smooth passes, no panic turns, no getting stuck on junk. If the group splits, circle back and re-stack them instead of chasing singles. When it clicks, the kill feed won’t stop, and you’ll hit the number before the battery gives out. Once you’ve got the feel for it, running BO7 Bot Lobbies as practice makes the whole setup way less stressful.

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