Mecha and Knife

Forge unparalleled mechs with the ambition of old age, and use the galaxy as a knife to smash the edge of the empire. His name is Ji Xinghe. When he was 65 years old, he went to Alien Battlefield to avenge his son. The old man is standing on the ground, his ambition is a thousand miles away, the old man wears armor, and fights to the galaxy, the old man drags his sword, it is not for glory. - Description from novelcodex.org