Guardians vs. Eridians
Or maybe it’s a Guardian. Guardians were creations of the Eridians seemingly made to defend the vaults. They’re bio-mechanical and their appearance definitely fits with the robotic arm picking up the mask near the end of the trailer. At the end of Borderlands: The Pre-Sequel there’s mention of a possible impending war. It’s unclear if that would be be with the Eridians, their Guardians, or some third, unknown alien threat. Or maybe Borderlands 4 has nothing to do with any of that.
