Fate Zero x Goku black OC

Goku Black... the name that brought fear to the people of earth in future Trunks Timeline, The man who claims that what he is doing is call "Justice". But what if I would to tell you that there is another Version of the so call God of Justice, the same one with a similar ideal. His name is Shadow Black, another Kai from a different timeline similar to the Zamasu which you may now know as Goku Black. Instead of killing mortals Shadow would kill all the bad ones who committed the most sins. Shadow Traveled to Future Trunks Timeline to help take down Goku Black and his counter part, After Merged Zamasu Defeat Shadow Black used his time Ring to go back to his timeline but before he was able to use it a familiar purple smoke covered the ring making Shadow go to a different world then his own timeline as he is now in middle of an unknown place, Follow Shadow into the world of Fate and see how he can be on par with other servants in the fourth Holy Grail war.

I do not own DBS or Fate series or any images.
(Little Reminder)
pleased don't criticize me since I was bored and wanted to do this for fun, also this is my first time making a book so please tell me how you guys enjoy it in the comments.