Re/Fate: Grand Order

A tale of a young magi to save humanity from extinction. Invited by Chaldea, the Master candidate number 49th will experience a gruesome fate.
Will this child of man succeed? Or will he give up even with the help of an unknown power that is both a curse and a blessing at the same time.
[Disclaimer: This fanfic is written by a newbie, so do expect some grammatical errors and bad writings of dialogues, story, and characters that might be ooc. I also accept feedbacks so please don't hesitate to comment as it will help me to improve.]
[Inspired a lot by Save Scumming? It's on my character sheet by Xorn. I highly recommend you to read that since in this one the only crossover of Re/Zero is just the RBD, Invisible hands authoritiy and Shamak on the mc instead of Subaru. And the main character is just a cheap ripoff of Subaru and I made this for an alternative story of the original from the game, not too much altering. Only some minor stuff while the MC won't be replacing Gudao, he'll experience the same as how the og story in-game since I'm not that creative. Of course I increase the difficulty too.]
[Basically I'll just put another guy as the main character in Fgo.]