I am the Grail

"Master, this is a foolish endeavor that you are trying to pursue."

"I know, but I'd rather be a fool then know I could've prevented a tragedy from occuring.

After the end of the Holy Grail War, Eden Sheol decides that the grail is an object far too dangerous for anyone to use. Steeling his resolve, Eden made his wish

"I wish to be the carrier of the grail, far away from any and all matter of this world line." The wish was something that should've been impossible, yet it came true, darkening Eden's vision, before he disappeared from his world line, no, his multiverse as he appeared in an entirely new world. One filled with monsters, gods, and adventurers.