That bit of information caused Skyfire to blink and tilt his head a bit, a curious expression on his face. "That is definitely interesting. I might try and look into that later..." It's less depressing than totally empty books left to rot on a shelf, but that meant he couldn't use a few to write in and replace them with new books later, at least not until he figured out what was going on.

"It would certainly be less worry than getting used to my new size in here at least." He gives Tsukishima a half smile. "You may ask all the questions you like." He might not always answer, but Skyfire doesn't mind curiosity.

"Mostly I need mineral deposits because I need something to eat soon." Pausing he adds "Granted, any kind of metal or mineral would do, but I've found it's generally less trouble to collect what I need myself rather than try and trade for it." Not that he really had anything of value to offer to trade with at the moment anyways.