Promised (Reluctant) Victory In Remnant

Reluctant OC Isekai with Nasuverse Excalibur into RWBY.
And to top it all off, a System that gleefully compels him to be the "Savior" of a world he'd rather leave to its own devices.
-Premise-
Someone who really doesn't give a shit dies.
And then... Forced to give a shit by being transported into a World that is about to collapse.
Why is he forced to give a shit?
Because he's literally got THE Excalibur at his beck and call at the behest of his after-life Reincarnator God or whatever.
Now, initially, he'd have wanted to chuck that thing into some dirty alleyway and let someone else worry about the end of the World.
But no!
He's got a darn system that forces him to be the quote-on-quote "Savior" of this world.
Else he'll suffer torture and a fate worse than death!

...If he was forced to use the Sword for anything, perhaps cutting trees would have sufficed.
NOT SUPERNATURAL MONSTERS?!
-Premise End-

He'll be OP.
Obviously.

(Another for Fun Fic THAT I HAVE NO OBLIGATION TO UPDATE SO EXPECT NEXT UPDATE TO COME WHO KNOWS WHEN!)

I don't own anything.
Not RWBY, Not Fate Stay Night, Nasuverse, and or Arthurian Legend.
Credit goes to the official creators, support the official releases, please.
Except that of Arthurian Legend - Pretty sure the Author's not among us, last I checked.
Don't own the cover either - Didn't like my last one so I changed it to this one.