Season 2 of Call of Duty: Black Ops Cold War drops today, and includes the new Outbreak game mode for Zombies. The new mode drops Requiem agents into a huge open-world environment with even more zombies and tasks to complete. These are the narrow corridors you’re used to — you’ll have to run and fight back entire hordes in the Ural Mountains of Russia.
It’s a very different kind of survival map, and to help you survive, Season 2 also includes new perk tiers specifically linked to Zombies. To unlock these new powerful perk upgrades, you’ll need special drops — you could already collect Aetherium Crystals in Zombies, but now you’ll need the rare stuff. Here you’ll find a full breakdown of how to find the new Refined and Flawless Aetherium required to unlock more Zombies upgrades.
More Zombies Firebase Z guides:
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How To Get Refined & Flawless Aetherium
Aetherium is a special upgrade material you’ll earn by completing rounds in any Zombies game mode. Aetherium Crystals are used to unlock upgrades for your perks — and to get Tier 4 / 5 upgrades, you’ll need Refined / Flawless Aetherium.
Refined / Flawless Aetherium drops on high rounds in any Zombies Mode. You’ll earn it just for surviving long enough.
- Refined Aetherium: +1 on Round 15. Earn +1 on Round 15 / 20 / 25. Earn +2 on Round 35 / 40.
- Flawless Aetherium: +1 on Round 30. Earn +1 on Round 30 / 35 / 40.
Basically, to get enough Aetherium, you need to play Zombies and survive for the most rounds. If you can reach Round 50, you’ll earn the 5~ Flawless Aetherium required for any of the Tier V perk upgrades.
More Call of Duty: Black Ops Cold War guides:
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