After seeing off the victim to the afterlife, the God of Void was about to walk away when he saw a black feather lingering and hidden under the shadows of the docks. After picking it up, he noticed that it was indeed a fallen angel's feather. A fallen angel is considered a devil in a sense, and thus he wasn't surprised that it can commit such an act and covet the wings of Lucifer.
The God of Void flaps his wings, and it fades as if it never existed. The original black wings, horns, and tail were also given back to Lucifer's new body. The pair of wings showed that the poor victim was just something he made using his ability to control light elements.
Though he can't control this element too well and he just uses it for healing, shaping it into a pair of wings was not hard for him.
