Borderlands 3Hammerlocked

"Hammerlocked" is the 11th Main Story Mission and is unlocked when you complete "Beneath the Meridian".

You’ve opened the Promethea Vault, but at great cost. It’s more important than ever to open the Vaults before the Calypsos grow more powerful. The next Vault is on Eden-6. Lilith’s friend Sir Hammerlock might be able to help, if he weren’t in a spot of bother.