The Future of Tyrant Song

The function of the Individual Time Reversal permission, actually known as the Embryonic Transformation Technique, was essentially a reverse version of the Aging Technique...

Under the Ruler's jurisdiction, the target transitioned from a powerful cultivator to a defenseless embryo within a few breaths!

The only regret is that when using the Embryonic Transformation Technique under the Ruler's Authority proxy permission, there was a spell duration. It was not true rejuvenation, but a reversal of individual time for a set period. Once the spell expired, the time reversal effect dissipated, making this secret technique unsuitable for longevity.

It's worth mentioning... The creator of this spell was the late Fat Ball. It combined time and curse rules to devise this secret technique.