Requested by @is_cake_an_option

Another regular day. His subordinates were spreading negativity from AU to AU, gaining power, killing barely anyone to keep that negative energy around. Unfortunately, Nightmare was stuck with paperwork, at his desk with glasses and a pen in hand. He was feeling tired and overall done with this.

That was until a sudden burst of negativity from a AU gave him energy. It was overwhelming and could be considered a competitor for Killer's level of pain. Nightmare decided to look around and see if whoever was providing this negativity could be used as a power source and work for him.

Teleporting to this mysterious AU, the atmosphere was... quiet. It was in Snowdin, possibly the most popular place in the underground. Because Nightmare was used to seeing dead monsters, it was no surprise he noticed the dust scattered in the snow. The only difference between the two being a subtle texture change. The snow containing gashes and footsteps of attacks and people who were most likely running for their lives. It seemed like this was another genocide universe. Similar to Dust's

Trekking on, the goopy skeleton parasite saw you.... You were the source of the negativity Nightmare was feeling. He felt strong, powerful, like he could do anything with you around. No way he was going to pass up a battery like this. Nightmare had to get you to work for him. No matter what...

Walking up to you, Nightmare quickly apprehended you with his goopy tentacles. The black skeleton couldn't risk having you teleport away.

"Greetings... I'm Nightmare. But you may call me your new boss." Nightmare says with a dark chuckle. His smile being mischevious.