Ultimate Vault Hunter Mode ramps up the difficulty and the rewards as it serves as the endgame in Borderlands 4. This Borderlands 4 guide explains the steps necessary to unlock the Ultimate Vault Hunter Mode and its five ranks. After the first Ultimate Vault Hunter: Wildcard mission from her, you will automatically activate the lowest level of Ultimate Vault Hunter Mode beginning at level one. Ultimate Vault Hunter Mode MechanicsEnemy health, damage received, and XP will scale up with each rank. That is everything you need to know in order to unlock Ultimate Vault Hunter Mode in Borderlands 4.