King to my heart

Nyx was a demon along with Meliodas. He was the leader of the Ten Commandments Nyx was like a mother to them. She was killed by someone who she trusted and would kill the world for that person. Little did she know she would be killed by the man she trusted the most. THIS WON'T HAVE THE SAME EVENTS THAT THE ANIME HAD, I WILL MAKE UP MY OWN.