If Necropolis is like a plague, they need human flesh; it’s their food. But the goal of demons is the soul. They can latch onto one of the sins: pride, greed, gluttony… and exploit it.
Since there is no evil on the human continent initially, people are free from vices, so the only place where demons can gain a foothold in the world is the Necropolis continent. That’s where evil has accumulated in abundance.
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