Savage Dragon #76

Dragon awakens next to the corpse of the young Damien Darklord in a burning lot. Much to his dismay, he discovers that Chicago is a veritable wasteland, inhabited by scavengers and strange mutated creatues, all of whom seem to want him dead. While flying over the city on the back of a blue bat-winged creature, Dragon realizes that the world was his creation - by killing Damien Darklord, and preventing him from travelling to the past, somehow everything changed. He eventually finds his way to his former home - only to discover a huge crater where it once stood.

Description from Image Comics