Double Penetration in the Last Days, I Refined the Billion Soul Banner

Traveling to the world of cultivating immortals, Mu Changsheng became a disciple of the Demonic Sect, and originally planned to eat and die. Unexpectedly, Mu Changsheng awakened the double-travel system of the zombie world and had an extra soul refining flag in his hand. What's even more outrageous is that all zombies are treasures. The soul enters the Soul Refining Banner, and the blood core in the brain improves cultivation. Henceforth Boss: I am in the stage of returning to the void, and my strength can crush you. Mu Changsheng: I have billion soul flags. Boss: I am in the Tribulation Stage, and my strength can crush you. Mu Changsheng: I have billion soul flags Boss: I am in the Mahayana stage, and my strength can crush you. Mu Changsheng: I have billion soul flags Boss: Can we not talk about the Billion Soul Banner? Mu Changsheng: Well, every soul in my Billion Soul Flags is in the Mahayana stage, including me, there are a total of 100 million and one Mahayana stages. Decisive in killing, careful in thinking, likes to stab in the back, single female protagonist