Either they are cultivators from other cultivation blessed lands, or they are returning members from the Red Flame Sect and its vassal forces...
The number of Heavenly Demons scattered across the Immortal Realm is not small. Cultivators below the Spirit Sea Realm can be demon-corrupted if they are not careful. Even those at the Spirit Sea Realm and above can end up demon-corrupted during focused cultivation, serious injury, or when abducted by powerful Heavenly Demons, becoming new mutated Heavenly Demons.
However, cultivators who have stayed long-term at Five Dragon Mountain do not have the means to encounter Heavenly Demons and are almost impossible to be demon-corrupted.
