Killstreaks are a cornerstone of the *Call of Duty* experience, and *Black Ops 6* Zombies takes this to another level. Here, they become powerful Support items, letting you unleash devastating attacks on massive hordes. The Dark Ops Challenge "Harbinger of Doom" tasks you with achieving precisely that: eliminating 100 zombies with a single killstreak.
Best Maps and Modes for 100 Zombie Kills with One Killstreak in *Black Ops 6*
Black Ops 6 Zombies offers Standard, Directed, and Jingle Hells modes. While Directed is popular for camo grinding due to easier matches, its smaller hordes make it unsuitable for the Harbinger of Doom challenge. Standard mode is your best bet.
Map selection is crucial. You need ample open space to maximize your killstreak's effectiveness. Locations like the Shipwreck on Terminus and the Liberty Falls spawn area near Pump & Pay are ideal due to their open layouts.
Best Support Items for the Harbinger of Doom Challenge

To conquer this challenge, choose from Black Ops 6's top Support items: the Chopper Gunner and Mutant Injection. The Chopper Gunner lets you rain down minigun fire from above, while Mutant Injection transforms you into a powerful Mangler. Both offer invulnerability and immense damage potential.
High-ranking players can craft these at a workbench for 2,500 Salvage. Alternatively, you can obtain them through RNG methods like killing special enemies, completing S.A.M. Trials, or using Loot Keys on Terminus and Liberty Falls. Crafting is recommended for reliability.
Optimal Strategies for 100 Zombie Kills

Aim for rounds 31-40 to ensure maximum horde sizes. Activating the Rampage Inducer further boosts zombie spawns and speed.
For the Mutant Injection, train a large horde in a confined area with multiple spawn points (e.g., Rec Yard on Terminus, Backlot Parking on Liberty Falls, or the Oubliette room on Citadelle des Morts). Activate the Injection, utilize melee attacks aggressively, and maximize your kills.
The Chopper Gunner strategy is simpler but requires precision. Gather a large horde in an open area (e.g., Shipwreck on Terminus, Backlot Parking on Liberty Falls, or Town Square on Citadelle des Morts), call in your Chopper Gunner, and unleash aerial devastation.
Master these strategies, and you'll conquer the Harbinger of Doom challenge and add another accomplishment to your *Call of Duty: Black Ops 6* record.