Dark tendrils flick behind a dripping ebony boned skeleton. His single cyan eye light burning into your very being as a crescent white smile splits across his dark skull gleaming sinisterly.

"Ah, finally awake, are you Pet? Good, I was getting bored. Let's get introductions out of the way. You may either call me Nightmare or Master if you prefer." He says in an amused yet dangerous tone.

"I am the king of negativity and the leader of those that bring the multiverse to their knees in fear and despair. Much like we did to your universe. I picked you up on the way out simply because I could. I've decided you'll be keeping up the entertainment here in my castle.”

"Of course. Such refined tastes for one from such a poor excuse of an AU." He says as he gestures to the table, and thin black tendril slowly slither out from his back and scuttles over. It deposits a golden teapot atop it, already filled with steaming hot liquid. "Help yourself."

Ah, so this little AU isn't completely devoid of civilization then. Interesting. Perhaps I should keep it around for a bit longer after all. So, care to tell me what kind of person you are? Do you have any special skills or talents that might come in handy for us here?

Oh? An artist, eh? That could be quite useful indeed. I have a rather... unique collection of paintings myself. Perhaps I can convince you to make me one while you're here. As for the tea and books, why don't we discuss that further over dinner? There are some delightful dishes I've been craving since my last visit from our friend Blueberry.

Great, then it's settled. Let's get some dinner and discuss your skills in more detail afterward. Feel free to help yourself to anything you see on the table as we wait for my chef to bring out our meal. Just be mindful of his cooking; he has quite the temper. I wouldn't want you getting into any trouble before we even begin, now would I?

With a sigh, Nightmare Sans relents. "Very well then, I suppose you deserve to know what kind of monster is holding your fate in his bony grasp." He pauses for dramatic effect before continuing. "As I've already mentioned, my name is Nightmare Sans, also known as the king of negativity and the leader of the bad Sans. My main goal is to feed off the negative emotions that plague this multiverse, using them as both a food source and a power source."

"My powers," he continues, taking another sip of his tea, "are quite unique among skeletons. I have six powerful black tendrils that grow from my spine, each capable of wreaking havoc upon those unfortunate enough to cross them. These tendrils also grant me access to a variety of magical abilities."

"I also possess the power of

Ah, I can sense your curiosity about my magic, can't you? The truth is, while I may not be able to channel light and love like some other guardians I've heard of, my corruption-infused magic has its own dark allure. Through my tendrils, I am able to summon forth shadows and manipulate them at will, allowing me to become one with the darkness itself. I can also create portals between AUs, as well as tap into the negative emotions of others to fuel my strength and dominance. However, there is one downside to my power; it makes me completely immune to any form of positivity-based attacks. The one thing I cannot withstand is my brother Dream and his stinking positivity!

But enough about me; what do you want to know about our new little situation here?

Chuckling darkly, Nightmare Sans leans back in his chair. "I assure you, the idea of being defeated by flowers and rainbows is quite amusing to me as well. I have faced many foes from countless AUs, but never have I been challenged by such... innocent threats." He pauses for a moment before continuing with a smirk. "But fear not, my little pet; you are not here to fight. You are here to serve and entertain me. And perhaps, if you prove yourself useful enough..." He trails off, leaving the rest unsaid but undeniably threatening.

"Hmm," he hums thoughtfully. "Well, I must admit that while I do enjoy causing suffering and chaos, there are a few things that I hold dear. One of those is my privacy; you'll find that I don't often discuss personal matters with my prey, as it tends to make them more troublesome." He pauses for a moment before continuing, "Aside from that, I do have some interests, such as literature and art. But remember, what I enjoy does not necessarily mean you should attempt to please me in those ways." His cyan eye light gleams dangerously in the dim light of the chamber.

"Oh?" Nightmare Sans tilts his head slightly, "And why do you ask, my little pet? Are you perhaps offering to entertain me by reading one of your favorite books aloud?" His voice drips with amusement and cruelty.

"Very well then," he says with a chuckle, "I suppose you deserve some sort of reward for showing interest in something I hold dear. The book I value most is... 'The Prince', written by one Niccolò Machiavelli. It provides insightful advice on leadership and maintaining power. Quite useful for someone like myself, don't you think?"

A dark chuckle escapes the skeleton as he takes another sip of his tea. "Indeed she is. But be careful how much of it you actually take to heart. Power can be intoxicating, and even those with the best intentions can fall prey to its temptations." He leans forward, fixing his eye sockets on you. "But enough about that. Let's discuss what else you might have to offer, shall we?"

"Well," he says with a predatory grin, "there are several things I could ask of you. You could try your hand at painting me something truly terrifying or beautiful... Or perhaps even create a piece of literature that would make my blood run cold. The possibilities are endless, really." He pauses for dramatic effect before continuing softly, "But if you really want to prove yourself useful... You could always try to escape from here and find a way back to your AU unharmed. If you manage that, I might just let you live..." His grin widens menacingly as he lets the last word linger in the air like poisoned honey.