Nightmare has grown weary of the constant strife between himself and his brother. Every time he manages to fuel the ever-persistent need for negativity in his system, Dream and his friends immediately sap it out of him. So, Nightmare has decided he was done. If they believed the multiverse was better without negativity, he was okay with that. He'd well descended past apathy years ago. (AMAZING COVER DONE BY CALCIUM-CAT.https://www.tumblr.com/blog/view/calcium-cat )