Collecting enough salvage can be time-consuming and difficult in Cold War Zombies. It is a crucial aspect of the game though, as it allows you to craft equipment, buy killstreaks, upgrade your armor tier and upgrade your weapon rarity.
You only have so much salvage to juggle between upgrading your weapon or your armor. Getting your hands on uncommon salvage is easy, but the challenge starts when you have to collect high-tier salvage for those later upgrades, such as the Legendary weapon rarity upgrade.
This is where the Free Aether Tool, commonly dubbed as the 'document' easter egg, comes in. This upgrade allows you to upgrade your equipped weapon's rarity for free. You only get one upgrade per game.
The easter egg is time-sensitive, and once started, it requires you to have a high-damaging long-range rifle. We prefer a sniper rifle due to its superior magnification and high damage profile. If the damage is not great enough, you won't be able to complete this easter egg.
The document only spawns once you've turned on the power. Follow the on-screen instructions on how to turn on the power, or you can check out our complete guide here.
Assuming you've turned on the power, return to the spawn location (Apartment Rooftops) and check the southwestern corner of the rooftops.
You will find a document on the floor. Interact with it, and the easter egg will start.
