From Fake Dreams

The Magus Killer was dying. He had done all he could to be a Hero and save as many people as he could. He killed his father to do it. He killed his adopted mother to do it. He killed his wife in the hopes to put an end to the need to do it ever again. He failed in rescuing his daughter as a result of his efforts. All he had left was a cursed and failing body, a sizable yet antiquated home in Fuyuki Japan, and his adoptive amnisiac son whose life he had destroyed in the first place.

And then the dreams came.

Dreams of War, Fire, Curses, unborn Gods, Heroes, and Monsters.

Dreams of unresolved conflicts, promises, dreams, and tasks.

Dreams with his nearly clueless son in the middle of it all.

The Magus Killer was dying. But he could still prepare for what was to come. And fortunately, that was something he was still terrifyingly exceptional at.

Currently at chapter 60 on FF.net