Buying A Lot Of Food!
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Benladann was right, perhaps he simply didn't bother with the big sects and guilds in the world, and merely targeted the mortals that were in the wild pretty much, such as all these wild villages, and the sect in here. Which was not being protected by any immortal, to be honest.
These were still "regions of immortal sects" because these sects were here, and by merely being here, they passively protected other mortals that didn't belong to their own sects, but this clearly didn't mean it was impossible for him to capture mortals around here.
In fact, these immortals didn't seem to care about those on their factions, they simply didn't let immortals get close, which ended in helping us as we cannot be targeted by immortals easily. But they can bring mechs and droids which can sneakily travel underground and assault us, right? Or he can even use mortals too, which the immortals won't be able to do anything against!