I, the Eternal Silence Walker, Specializes in Killing Immortals

The lineage of Eternal Silence Walkers, passed down from generation to generation, specializes in killing the Immortal Emperor. Before he died, the master gave me a knife, pointed at the glowing "bubbles" in the sky and told me to kill the Immortal Emperor. The good news is, this world is, so to speak, my creation. The bad news is that as a seventh-generation descendant, I am now about to be drowned by the dark tide of my own design.