Rumors have spread in great detail, claiming that the Hundred-Tempering Child, upon reaching a hundred years of age and deteriorating to the limit, would place himself in a coffin. Buried alive for three years, then upon breaking out of the coffin three years later, he would emerge as a child again.
As for whether this is true or false, the common folk are entirely clueless.
The world respectfully refers to the Hundred-Tempering Child as the Hundred-Tempering Immortal Master.
The Hundred-Tempering Immortal Sect is a fairly dominant Immortal Sect that has been growing stronger over the years.
As for the infighting and power struggles among the sects within its jurisdiction, the Immortal Sect generally doesn't interfere.
Competition leads to becoming ever stronger.