One day, the world changed. People started gaining powerful abilities only seen in fantasy but that wasn't the only thing to change, soon monsters started appearing and changed the structure of power, now only those with strong abilities could live freely and everyone else would suffer under their rule. The MC lived many years in that life as a normal person until he got in the way of an ability user and died because of it, now he was sent back in time with a power of his own. Feeling the sweet temptation of being powerful he'll do whatever he pleases in his new life.
-----------------------------
This story is about a dark MC getting rid of morals so if you don't like things like innocents dying or incest etc, basically anything seen as wrong it's not for you.