Multiverse Viewer/Transporter.

This device in my story idea is exclusively from the pre-era. It was used by gems who were curious about what goes on in other universes. It looks a bit like a crystal ball, but of course kinda bigger & more technical. It also allows them to visit those worlds. Which some of my sort-of-OCs & OCs visit. The worlds/universes: Fairy Tail (which turns to be not just in their universe, but in the far distant future), Winx Club, My Hero Academia, Star Darlings, & Bakugan.