Sign in at the peak of the imperial realm at the beginning, I am invincible

Story of: Sign in at the peak of the imperial realm at the beginning, I am invincible[Pure invincible and cool story + no heroine + no upgrade + system ownership + decisive killing without saintliness] Li Xiao traveled to the fantasy world and activated the invincible system. His realm reached the top in one second in any plane. The system also opened up all permissions. Top-level elixirs? Gongfa? Immortal tools? Talismans? Take whatever you want. Hiding your cultivation and pretending to be a pig to eat the tiger? It doesn't exist. My strength doesn't allow it. Li Xiao: Don't even think about pretending in front of me, even the Immortal Emperor. I'm afraid I can slap you to death with one slap. I'm invincible, you can do whatever you want. (The introduction is weak, godfathers, please move to the main text)