Went to search on Google and found out it changed to Fate/Worthy.
Fate/Resistance, the mc is an actual magus in this one, set in Fate Grand Order. He's participated in the Grail War Marisbury was part of and lost, but got something hella interesting in exchange. This one is detail oriented, a bit serious and has smaller chapter amount at the moment but greater than chapter average length. Also, Scathach.
Fate/Disturbance
Anime & Comics · Bleap
If anyone wondering that's the exact way mushashi was cloned in Baki.
Still, when Shishio thought about his girlfriend in his previous life, he hoped that his girlfriend wouldn't become crazy and created a clone of him. His girlfriend was a scientist, and she was very interested in cloning technology. If that girl really created a clone of him, then combine it with the knowledge of dark magic to call his soul back before putting it back to the cloning body.
I Refuse to Become Scumbag in Tokyo
Anime & Comics · akikan40
Search Fate/Worthy on Webnovel itself and make sure to be on the fanfiction section
Fate/Resistance, the mc is an actual magus in this one, set in Fate Grand Order. He's participated in the Grail War Marisbury was part of and lost, but got something hella interesting in exchange. This one is detail oriented, a bit serious and has smaller chapter amount at the moment but greater than chapter average length. Also, Scathach.
Fate/Disturbance
Anime & Comics · Bleap