In the Nine Hells, the system of the devils, Baalzebul no longer had the fame of a legendary Covenant general. He looked to claim what he felt he deserved, the generalship of an entire world. For sixty years, Asmodeus had been saying he hadn't made up his mind who would rule Maladomini, as Lord of the Seventh. Baalzebul finally figured out what the boss wanted, someone to earn it.
On 3 Lunar 9474 GE, during the aforementioned war, Baalzebul became an Archdevil. Asmdoeus made a deal with Baalzebul, giving him command of the world Maladomini. Baalzebul took the oath, pledging fealty to Asmdoeus as Hells Overlord.