Cultivation is nothing, mecha is a man's romance! Mecha's sermon is now!
Before the destruction of the original civilization, they observed and tried to analyze the unique energy (spiritual energy) of the "Lingyuan Star Field", believing that it contained the mystery of the origin of the universe. Some experimental weapons/mechas (such as the protagonist's "Stardust") are designed to absorb, transform, and even "format" aura energy. The world of cultivation may have been a large-scale experimental site or energy collection point of the original civilization. Extraterrestrial demons are out-of-control AI or energy creatures that were leaked when the original civilization was destroyed and were contaminated by spiritual energy.
A very nice novel about mecha VS cultivation.