Justice or Injustice? - DC Injustice AU Story x Male Reader

When one of the greatest heroes on Earth, loses the only person he cared for in the world, after losing so much, his family, friends and now his supposed to be Wife; Kara Zor-El aka Supergirl which effected a lot of friends and family alike, but her death changed one man completely, from the kind hearted Human warrior to a more sinister, and darker self, doing whatever it takes to make change, even if he has to kill to make a change, that being the worst of criminals.

He was once called: "Inarus, the Warrior of Peace, but this change had given him the nickname: "Nemesis, the Reaper of Life" - his identity on the other hand is Y/N L/N: The Last Knight of his people.

But when he starts killing and goes completely rogue, appearing weeks after Kara's funeral, the Justice League beg to question: Is he a threat that must be dealt with? He claims the League "Weak and unwilling to do what's right"

The question is however... Is it Justice or Injustice???