So Cool, so Cool

I'm Used to Traditional Fantasy and System Flow. Is There Any Immortality Literature?

I want to read a book like "The system gives me immortality, and I will eventually become invincible while I'm alive". Ever since I got tired of searching, I can no longer hit the target immediately. I randomly turned to Blind Man Playing the Erhu and Chen Xun Ximen Hei Niu. Is there any novel like this? There is no reverse slap in the face or killing indiscriminately.