Finishing off BNK3R, and descending into Control Core Angel, in the hopes of obtaining the Vault Key.
Disclaimer: Borderlands 2 is a game developed by Gearbox Software, and published by 2K Games - I do not have any affiliation/association with Gearbox or 2K, nor do I claim to have any affiliation/association with them. I do not own, or claim to own, any part of the displayed content - this video is for entertainment purposes only.