The Great Techno-Crash was a major event that disastrous event that happened in The Last Guardian, in which thousands of old and new devices with Koboi technology, both above and below ground, ceased working and a large ammount of the technology exploded. The Crash resulted in a large ammount of casualties and fairy sightings. To make matters worse, 200 assorted weapons were scheduled for recycling but were all dropped at once, resulting in a huge nuclear explosion which dealt a lot of casualties and fatalities.
Effects on the Human World
Although the initial reaction to the crash was a reverting to the medieval lifestyle before electricity, people have gradually rebuilt their technology to a time reminiscent of 1970s-80s with radio making a reappearance among other things.