A Living Restriction (1)
After knowing that Zhu Wuwan was "probably" a Mahayana Quasi-Immortal, Patriarch Moondevil was like the other high-ranking officials of the empire who were enslaved by Zhu Wuwan. He immediately became obedient. This was also Zhu Wuwan's intention.
Since this method could save some trouble, Zhu Wuyang wouldn't reject it just because of some problems such as face.
After learning that Zhu Wuan was a Mahayana Quasi-Immortal, Patriarch Moondevil's thoughts were dispelled. Especially after Zhu Wuan took out a large number of treasures unique to the Heart Control Sect, Patriarch Moondevil no longer suspected this matter and began to do as Zhu Wuan instructed.
In order to keep this matter a secret, Patriarch Demonic Moon assisted Zhu Wuyang in enslaving some of the higher-ups of the Demonic Moon Empire. Basically, he controlled the entire Demonic Moon Empire.