Fate: The Darkness (Harem X Male Reader)

(Y/N), embrace the darkness!!!! At Last!!!! I FEED!!!!!!!!!!!!!!!!!!

(Y/N) (L/N) was born in the New York City and he was become homeless little boy...no foods or drinks...he was been hunger for long hours and sometimes life is always been screw up and he felt like dying until he was been adopted by this mysterious stranger name is....Kiritsugu Emiya/The Mage Killer who was assassinated at those mages around in the world. Now he trained the young boy to be an assassin like his own father Kiritsugu...become the best professional assassin and hitman. Then after many weeks and years that (Y/N) become growing up with his teen form and he was become the master and same to his own father Kiritsugu...now the two of them become the masters and using servants fighting at the other masters in Holy Grail Wars.

Now there was something dark secret for what keeping the true demonic entity inside at (Y/N)...and it was terrifying and horrifying compare than God and (Y/N) was become the Darkness's host. Now the Darkness using (Y/N) to become a killing machine and unstoppable and turn him into the most deadliest indestructible and...monster.