Backed By A Ninth Level Civilization, Mecha Slaying Gods Is Quite Normal, Isn't It

[Mech+Black Technology+Unknown Civilization+Technological Power+Starry Ocean]The Earth was completely occupied by sea beasts, and Yu Xingzhou was reborn and returned. With the help of the "nine level civilization system," the Earth's civilization was promoted from 0.75 level civilization to 2 level civilization within a few months.From then on, mechas rapidly iterated, with first generation mechas, second generation mechas, flood level mechas, and disaster level mechas born out of thin air!Controllable nuclear fusion, hand cranked mechs, antimatter cannons, space elevators, and the Heavenly Palace Creation Program are all within reach!"Anthropomorphic sea beasts? Sorry, we humans have already undergone physical fusion. What kind of garbage is silicon-based organisms?""Sea beast, I am standing in front of you. Do you see how much I look like before?"After the complete elimination of sea beasts, Yu Xingzhou led the entire Chinese civilization into interstellar civilization.Unknown civilizations have observed their own "bugs" being eliminated by humans somewhere in the universe, following the Dark Forest Law, and immediately plan to personally destroy the Earth.However, when the first starship arrived at the edge of the solar system, a huge star class mecha appeared in the pitch black universe:"Bold! I am the Commander in Chief of China, without the Edict of the Folding Dimension of China, I am not allowed to enter the border!"Unknown Civilization Startled: "Activate Space Leap, evacuate at full speed!"The next second, a thin piece of paper was seen flying towards their galaxy from the solar system.Unknown Civilization: "What?! That's two-way foil?"Yu Xingzhou: "What is the two-way foil? We in China call it the J-star life and death book.""I'm backed by a ninth level civilization, isn't it normal for mechs to slay gods?"