The Duelist of Determination

By Ulrich362

(Author's Note: I do not own Yugioh or Undertale.)

On an island in the middle of the Pacific Ocean, a man in a black suit walks down a hallway in a large castle before stopping and knocking on a large doorway.

"Is there a reason you're disturbing me this early Croquet?" inquired a voice from behind the door.

"You've received a letter Mr. Pegasus, it's from a young girl claiming to be the Monster Ambassador." Croquet explained. "Apparently it came from a small village located at the base of Mt. Ebott."

"Mr. Ebott, isn't that the mountain where the monsters were rumored to have been sealed away hundreds of years ago?" Pegasus inquired before opening the door revealing himself to be wearing a red suit with a glass of wine sttingon a table. "Let me see this letter."

"Of course Mr. Pegasus." Croquet replied handing an envelope to Pegasus.

"Let's see here." Pegasus stated while opening the envelope and taking out the letter before beginning to read it.

"Dear Mr. Pegasus, my name is Frisk Dreemurr, adopted daughter of Toriel Dreemurr and current ambassador for Monsterkind. I've always wanted to learn how to play duel monsters but never found cards that felt right. That's why I wanted to ask if you could make me a deck based on my adventures in the Underground. The time I spent there is a time that I won't ever forget and it helped shape me into the person I am now. I know it's asking a lot of you to make cards specifically for me especially knowing how busy you must be, but I would really appreciate it if you would think about it. It would really make Yugi happy if he knew we could duel again. Thank you for reading this, and at least considering it. Sincerely, Frisk Dreemurr."

"What are you going to do Mr. Pegasus?" Croquet inquired. "If she knows Yugi Muto then…"

"Have a plane prepared, Croquet." Pegasus instructed before walking over and picking up the glass of wine. "If I'm going to be making little Frisk here her deck I'll need to know what I'm working with. Friends always do make the greatest enemies, and with Duelist Kingdom coming up soon well, the more friends little Yugi-boy has the better."

"Of course Mr. Pegasus." Croquet stated calmly before walking out of the room.

"Frisk Dreemurr is it, I have a feeling things are going to be much more entertaining than I initially thought they'd be." Pegasus noted with a chuckle.

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"Good morning my child, you seem happy about something." noted a female goat creature in a purple dress.

"I am mom." replied a teenage girl in a blue and purple striped shirt. "Sans said he delivered my letter, and Dr. Alphys said to come over today."

"Oh, then it's finished?" the goat creature inquired. "That's wonderful news."

"So are you finally going to tell me what this big secret is Frisk?" questioned a ghostly girl in a green and yellow striped shirt that was floating next to Frisk.

"You'll find out soon Chara." Frisk replied as someone knocked on the front door. "Who is it?"

"It's me darling." came a robotic voice from the other side of the door. "Dr. Alphys asked me to come get you since Sans is helping with the finishing touches."

"Alright, I'll be right out Mettaton." Frisk answered. "Bye mom, I'll see you later."

"Ok, I'll have a slice of chocolate pie waiting for you when you get back." the goat creature said with a smile as Frisk walked out of the door and looked at a rectangular robot.

"You're not in your EX form?" Frisk inquired.

"Alphys said she was working on a way to make that form more efficient, though in the meantime it's more efficient to stay like this." Mettaton explained. "Well then, shall we go?"

"Yeah, I am." Frisk answered before walking towards Alphys' lab with Mettaton.

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"just a little bit more and it should be ready." noted a short skeleton in a blue jacket as he held up a small lizard creature in a labcoat with blue magic. "do you think this will work Alphys?"

"Well, it should in theory Sans." Alphys replied. "If… well if my understanding of Determination is accurate at least."

"that's a good point, but Undyne helped out so it should be fine." Sans mentioned while lowering Alphys to the ground. "besides, the worst thing that happens is it doesn't work the way we think. it'll be fine."

"I… I hope you're right." Alphys said nervously as Frisk and Mettaton walked up to them.

"hey kid, you're just in time." Sans noted. "we just finished up."

"Finished up, what is he talking about?" Chara asked nervously. "Frisk…?"

"That's great, where is it?" Frisk asked as Alphys picked up a small bracelet and handed it to Frisk. "This should let Chara and you share your body more effectively. As long as you're determined enough."

"she's right, if you want Frisk you can let Chara walk around for a while and vice-versa as long as you're wearing that." (1) Sans explained while Frisk put the bracelet on her left wrist only for him to turn towards Chara with as his eyes turned black. "you're getting a chance to prove yourself, mess up and you're in for a bad time."

"Chara's fine Sans, remember she's the one who saved our lives." Frisk pointed out. "It took two years for her recover from that."

"yeah I know kid, who knows maybe she'll prove me wrong just like you did." Sans noted with a grin. "after all, if a lazybones like me can put in this much work then someone who was willing to kill their own kind can change too. right Chara?"

As Sans said that, the bracelet started to glow only for the sounds of a helicopter to suddenly sound outside.

"Huh, what's going on?" Frisk asked.

"who knows, but we should probably find out." Sans mentioned as the four of them walked out of the lab as an Industrial Illusions helicopter landed in the center of the town and Pegasus stepped out of it.

(Frisk Dreemurr, the ambassador of monsterkind has requested a duel monsters deck and her friends Sans and Alphys have created a device to help Chara come back from the dead. Next chapter Frisk will introduce Pegasus to her friends from the Underground and tell him about her adventures. As always any reviews or critique is appreciated.)

(1) (The bracelet responds to Determination, Frisk's body contains both her soul and Chara's. The bracelet responds to that Determination, and lets them switch who is in control of the body at any given time kind of like the Millennium Puzzle does for Yugi.)