This side quest serves as a guide to the four new Vault Hunters in Borderlands 4 Rafa, the Exo-Soldier: A high-tech, ex-military archetype with a focus on guns. Vex, the Siren: A mage-adjacent character with a mix of warlock and necromancer-style magic, Amon, the Forgeknight: A burly, beefy character whose life mission is to rid the universe of vault monsters.Harlowe, the Gravitar: A former Maliwan combat scientist focused on technological creativity, crowd control, and cryo or radiation damage.