Kryptonian Life to Practice Martial Arts, You Kryptonian Life of Others?

Zhao Xuanyi traveled to an era of war and chaos and demons were rampant. He found that he had awakened the Krypton Life System and could use his lifespan to perform martial arts deductions. But the problem also arises, what should I do if my life is not enough? Easy to handle! Borrow it from a monster! From then on, Zhao Xuanyi embarked on the road of killing monsters, making sure to squeeze out every drop of remaining value from the monsters. "Brother, I really don't have a drop left." "Oh? Then you can finally die!"