They'd harvest energy to make weapons, then to decorate their bases with energy items. They'd use resources to feed and aliment their vehicles, using all of their resources raw like gems in SU, leading them to their current state due to greed and reckless use of their resources

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwih1eyrnJPWAhXE4CYKHbZ5AyYQFggmMAA&url=https%3A%2F%2Fwww.roblox.com%2Fgames%2F923163348%2FBen-10-Arrival-Of-Aliens-Test-Read-The-Descriptio&usg=AFQjCNHvRIVlD_DmYdiK5TGGMu5A51yYsQ The link.

@cheatster9000x thanks

@oldtaku_dd I agree, though i don't feel omniverse was that awful.