The End of the World: I Am the Master of Machines

[System + Profession + No Holy Mother + No Heroine + Mechanical Apocalypse + Decisive Killing] Nightmare accidentally traveled to a world completely different from the original Blue Star. He thought he would live an ordinary life in this different world until the arrival of the system... I thought this would be an ordinary day, but suddenly the system appeared all over the world, and many zombies appeared all over the world. These zombies are not like those shown in the previous movies. They are all mortal bodies. The zombies in this apocalypse all have mechanical bodies. As time goes by, those zombies gradually become rational and able to think. At the same time, various monsters slowly appeared... Mechanical beasts, mechanical mutant plants, Zerg, etc. Fortunately, after the system came to the world, Nightmare got the [Mechanical Master] profession This profession can create various mechanical creations out of thin air through the profession's unique [Mechanical Value] attribute. With the help of this profession, Nightmare built an extremely powerful mechanical empire of his own in the last days! [The front may be a bit boring, you can jump directly to the back]