I Use Immortality Genes to Reverse Immortality

Ling Tian suffered from an incurable disease at the age of 18 and traveled to a different world after his death! But he was seriously injured and only had 2 hours left to live! In order to survive, Ling Tian injected a medicine called "Immortal Gene", and his life span actually became negative! As long as he experiences life danger every time, not only his life span can increase in reverse! And you can unlock skills! The host's internal organs bleed, the virus concentration rises to 1%, and the life span increases in the opposite direction - 25 years! Unlock the skill [Breath of Life]! The host's heart bleeds, the virus concentration rises to 30%, the life span increases in reverse - 50 years, and the skill [Blazing Red Lotus] is unlocked! The host is shattered to pieces, the virus concentration rises to 40%, the life span increases in reverse - 75 years, and the skill [Red Lotus Storm] is unlocked! … Things that seemed extremely dangerous to outsiders, in Ling Tian's eyes, were stepping stones for his upgrade. What about "One person destroys the gangsters", "Leap level challenge to the Four Suns", "One person challenges the Star God"... Let's see how Ling Tian relies on the "immortality gene" and "proficiency" system to embark on the path of changing his destiny and become the "black swordsman" who is feared by everyone!