Monsters Invaded, I Evolved a Mecha

Please note before reading that this is not a mecha battle novel, but a mecha battle against monsters, and mechas do not appear at the beginning. This book is not only enjoyable, but also logical. This book is also called "Mecha Warrior", with elements: giant monsters, invincible, the protagonist is calm and shrewd, and decisive in killing. X-particles invaded the Blue Star, monsters and beasts appeared, technology failed, human beings were retreating steadily, and spiritual warriors appeared at the critical moment of life and death. Each spiritual warrior can independently choose the direction of evolution, whether it is a giant gun or cannon that destroys the world, or a cold weapon that is sharp, fast and powerful for assassination. There is no weakest spiritual warrior, only the weakest person. He Lei, an intelligent engineer who traveled through time, chose a path of his own. Based on the core of his past life knowledge structure, he uses spiritual energy to evolve intelligent organisms, and uses scientific power to cultivate spiritual power. When the city was attacked by countless monsters and was in danger, he put on a mecha and attacked forcefully. With one man against ten thousand, he single-handedly killed king-level monsters, killed thousands of monsters, and saved the whole city. The world is shocked. It turns out that Lingwu can be used both at a distance and at a distance?