Life-Draining Deduction: Invincible from Slaying Demons

Expend lifespan to deduce martial arts and cultivation techniques. As long as there is enough lifespan, one can achieve sainthood instantly.

This world is overrun by demons and monsters.

Some wear human skin and serve as court officials, secretly devouring countless humans.

Great demons can swallow an entire city of humans with a single gulp.

Shen Lin transmigrated here, starting as a mere yamen runner, without any prominent family background or sect inheritance.

Fortunately, he awakened the Life-Draining System. By slaying demons and monsters, he can obtain their remaining lifespan to deduce martial arts and cultivation techniques.

From [Blood Battle Saber Technique] to [Sea of Blood Sky-Splitting Saber], from [Golden Bell Shield] to [Great Sun Demon-Burning Golden Body]!

From then on, those demon saints and devil lords who acted tyrannically and treated humans as food ushered in their doomsday.

This book is also known as "Hehehe, demon, don't run, your lifespan belongs to me...