Fantasy: I Have a Sword That Can Leapfrog and Kill Everything

PS: The plot is compact, not watery, and tends to be traditional. [Travel/System] + [No/Single Female Protagonist] + [Plot Flow] + [Not a Brainless Cool Story] + [Non-Invincible Flow] + [King of Glory Elements] + [Be Cautious When Entering the Trap] The protagonist Meng Xinghe entered Qi refining before he was eighteen years old, but was ambushed by a mysterious organization. He was eventually seriously injured and fled to the land of Gui Xu and Ji Abyss. And activate the system's gift to get a heaven-cutting sword. Zhan Tian gave Meng Xinghe two abilities: One is the killing skill "Beheading" and the other is the auxiliary skill "Health Bar Display". When the enemy's health bar reaches the killing line, no matter you are in the Qi Refining Realm, the Hedao Realm, or an Immortal, I can kill you with one sword, regardless of any realm. So, after Meng Xinghe leaves Guixu, what will happen outside, and what kind of friction will there be with the mysterious organization? Also, what other abilities will the protagonist realize? Let me explore slowly in the book together.