The Vault key is a key item and plot device in the game. The key is made of 4 pieces, all obtained from various quests along the main storyline. Once completed, the Atlas Corporation's Crimson Lance intervened and steals the key for themselves, declaring the Vault and its contents their property.
|Vault Key Piece Number||Key Holder||Mission|
|1||Sledge||Battle For The Badlands|
|2||Krom||The Next Piece|
|3||Rakk Hive||Another Piece Of The Puzzle|
|4||Baron Flynt||The Final Piece|