Weapon Core

The Weapon Core is the item that starts the Ada-1 forge quest in the EDZ. It is in a stolen Black Armory crate in the Outskirts or the Gulch, usually near an orange-bar enemy called the Saboteur. You don't need to kill that enemy to loot the crate. The core is then charged with 25 Compound Ether, collected from Fallen enemies. Guides for this quest are older, so the steps may have changed.