An Immortal Emperor!
As long as he declares he's looking for a wife, the women within a million miles would gather around with their marriage proposals, wouldn't they?
Even if he's mute, barely three feet tall, and utterly unattractive, it's still easy.
...
"By the way—"
Chen Qiu suddenly thought of something, waved over the eldest Bai Family daughter next to him, and looked at the pretty girl before him. He nodded thoughtfully: "Interesting."
Across the Continents, those afflicted with "Immortal Cancer" are random; Immortal Cancer is originally a bug.
A bug that hasn't been fixed.
The Heavenly Dao simply never bothered to fix it. As for entire sects suffering from Immortal Cancer, that's also a bug, just a bigger bug.
The precondition for triggering this bug is having a cultivation level surpassing an Immortal.