Anamoly in Apocalyptic World

In a world where apocalypse is imminent a soul that did not belong to this world and in the whole universe comes through a summoning performed by a cult who believes in demon king.
What Havoc and choes would this anamoly will bring in already chaotic world. Follow the story of the biggest cosmic error and the most powerful soul since the beginning of space and time as he has his fun in this choes with a new identity.
Will he bring salvation or destruction follow him to know more.....