Stuck In Equestria Extra: A Nuclear Reactor In Every Basement · 5:34pm Apr 5th, 2014
This post explains about the crystal that powers the library in the main story. Extra special thanks to Midi, who questioned its existence, and to be honest, I should've explained it better. Sorry guys.
"So Twilight, there's something I've been meaning to ask you," I said from my comfy position in an armchair in the private study area of the library, three days after the news Princess Celestia was working on making black gold turn into real gold (i.e: oil to gasoline).