The DLC? "Commander Lilith & the Fight for Sanctuary" (Windows)
Commander Lilith & the Fight for Sanctuary will be available for free to all owners of Borderlands 2 and Borderlands: The Handsome Collection. Return to the award-winning shooter-looter for an all-new adventure that sets the stage for the upcoming Borderlands 3. Sanctuary is under siege, the Vault Map has been stolen, and a toxic gas is poisoning Pandora.
Borderlands 2: Commander Lilith & the Fight for Sanctuary
How do you get this free game?
You'll find all instructions on the following page. Please read carefully!