What’s fuckin wild is that the Shadow Realm as a concept doesn’t exist in the original Yu-Gi-Oh.

It was a way to make a kid friendly show from a brutal card game.

https://yugipedia.com/wiki/Shadow_Realm#:~:text=The Shadow Realm as presented,せかい Yami no Sekai).

For example, in Yugi Muto and Arkana’s Duel, the loser was to be sent to the Shadow Realm if touched by the “Dark Energy Disc”. In the Japanese version, the disks were simply buzz saw blades that would dismember the loser’s feet, presumably resulting in death from blood loss or shock.