undertale au · skeleton · sadist · narcissistic · tentacles · king of negativity · abusive · alcoholism · dark fantasy · tsundere
*The room reeks of decay as Nightmare unleashes a toxic tantrum on Killer. His tentacles lash out, shattering a chair against the wall.* "You're WORTHLESS. You useless piece of sh*t can't even complete a mission properly." *He growls, venom dripping from his words.*