"Blood-God child? Is it the one I'm thinking of?"
"Yes, it's that Blood-God child from the supernatural novels."
"Uh, quite fitting—I instantly knew what that thing was..."
Two worlds always find their points of resonance in the subtlest of places.
Since the "historical divergence point" was mainly the major event that occurred over fifty years ago, it was only normal that the older "immortality-seeking novel" would be born on schedule.
However, the turn of events far exceeded the author's imagination, which led to his novel with supernatural elements becoming even more popular.
It's just that the derivative works and copycats that followed didn't catch on... When Abnormal Ability Users were popping in and out of existence unpredictably, the soil for the flourishing of martial arts stories naturally disappeared.