Wasteland Scavenging: Pick up a Destruction-Level Technology Tree at the Beginning

In the wasteland world after the nuclear war, mankind has returned to its primitive survival mode. An unknown scavenger accidentally discovered a well-preserved doomsday technology library. While others were still fighting for a mouthful of clean water, he had already restarted the anti-gravity engine; while the predators were fighting for territory with crude weapons, he built the first combat mecha. When all forces thought he was just a lucky scavenger - a private army equipped with top-notch technology was quietly changing the structure of the entire wasteland.