Review Detail of LaoTze in The Holy Maiden Uncovers My Coffin When I Just Become An Emperor's Corpse

MC reincarnated into 10,000 year old corpse of an emperor level cultivator as people are scheming to steal and refine his incredibly powerful body. He kills most using the only remnant he has of his previous cultivation -- his aura-- and takes one of them as his maid. His system, unprompted, continually gives him new cultivation techniques and improving his physique. He goes around killing people, to absorb their blood and cultivation to regain his emperor level cultivation, and gathering more slaves. The plot (14 chapters in) lacks any sense of threat: even though his cultivation level is low, his aura and body make him invincible. Also the system is continually making him more OP so there's no need for him to do anything. It's boring, the MC is arrogant, and it's jarring that he transmigrated and immediately forms a plan to kill people to absorb them and also casually enslaves people. There's no self reflection.