Here's the third chapter. Enjoy!

P.S I apologize for any mistakes I make in advance.


"Man, this was the most boring job I've ever been on! We didn't even get to do anything!"

"Hey, at least we got to fight some Vulcuns."

"But they were so easy to defeat!"

"Stop whining Natsu."

"Hey! You were complaining about lugging the materials down the mountain the whole way down!"

"Well, I wouldn't have if someone didn't roast the original set we got. Thanks to you, we had to go back all the way up the mountain to get new ones."

"But I was fighting the Vulcuns!"

"And I thought you said they were easy to defeat."

"Shut up ice princess!"

"Only if you shut up pyro!"

"How about both of you shut up?"

"Aye!"

"Yes ma'am."

Erza crossed her arms and glared at both of the boys. "And if I hear one word out of either of you for the rest of the trip, I will not hesitate to personally shut you both up. Understand?"

"Y-yes Erza." said Natsu and Gray nervously.

Erza looked pleased with herself. Then, the group continued their walk to Sans's house. They had just finished getting the materials Sans needed for his experiment. Even though there was a bit of delay with the Vulcans they had to deal with, overall the job took almost no effort at all. In fact, Lucy thought this was one of the easiest jobs she had ever been on. She was pleased. That meant she could pay her rent and not go through a world- ending crisis for once. Suddenly, a shout from behind broke her out of her thoughts.

"Hey! Watch where you're lugging that thing!"

"My apologies sir."

"Hmph! Pay more attention to your surroundings next time!"

Lucy frowned when she saw the situation. One of the items they had retrieved for Sans had accidently knocked a merchant cart over. She sighed. It wasn't the first time this had happened on their way back. She glanced back dubiously at the huge pile of materials that Erza was dragging behind her. She sweat-dropped. What kind of experiment needs this many materials anyways? I never thought I would say this before but, I'm pretty sure this pile is bigger than Erza's luggage load.

Luckily, after that incident, the group spent the rest of the walk back without much trouble. But, they didn't notice the cloaked figure following them.

The figure watched the Fairy Tail wizards as he took out a pocket sized communication lacrima. He spoke quietly into it. "Master, shall I proceed with the mission?"

The figure listened for his boss's response. Then, he silently began to follow the group of mages.


"anyways, thanks a bunch for gettin' those materials i needed. lemme get your reward. be right back."

Sans got up to get the jewel. The Fairy Tail wizards sat there for a few minutes before Sans came in with 500,000 jewel in hand.

Erza took the reward. "Thank you."

"no problem."

Suddenly, as the Fairy Tail wizards began to leave, a loud crash was heard from below them. The wizards were confused.

"Huh? What was that?" asked Natsu.

Everyone looked to the owner of the house for answers. His smile was tense. "i dunno. it sounded like it came from my lab. maybe something fell over. i'll go check it out. you guys can go."

The wizards began to leave, but they were stopped by Natsu exclaiming, "Hey! There's someone down there. I can smell them!"

"umm, hey buddy, are you sure? cuz no one else should be down there."

"Yes I'm sure! My nose never lies!"

At Sans's confused expression, Happy explained, "Natsu has Dragon Slayer Magic which means he can take on certain attributes of dragons, one of them being smell."

Sans sighed. "welp, looks like i gotta go deal with it."

Natsu shook his head. "No way! I'm gonna handle this! I've been itching for a real fight all day!"

With those words, Natsu ran past Sans and down to the laboratory in Sans's basement.

"umm..."

"It's okay, Natsu'll be fine. It takes more than just a common burglar to knock him down."

As Erza said those words, Natsu came flying out from the lab and landed in front of the group. He had multiple injuries on him and was knocked out cold. Everyone was shocked. Whoever had did this, had to have been a strong mage.

Sans looked down at the unconscious form of one Natsu Dragneel. "welp, i guess it's more than just a common burglar."

Erza faced towards Sans. "Stay here. My comrades and I will handle this."

Then, Erza and Gray ran down to the lab with Lucy and Happy trailing behind them.

Sans watched the wizards run down the flight of stairs leading to the lab. After looking around to see if anyone was watching, Sans took his left hand out of his pocket. Suddenly, Natsu was surrounded by a blue glow. Sans floated Natsu in the air as he guided him to a couch in his living room. Then, Sans sat down on the couch opposite to Natsu and grabbed a bottle of ketchup from his coat. Sans guzzled down the ketchup while watching over the unconscious form of Natsu Dragneel.

It looked like the wizards would be doing the work here for him today; who was he to complain?


After telling Sans to stay behind, the remaining Fairy Tail wizards cautiously made their way down into the lab. As they made their way down into the lab, the first thing they noticed the mess. There were blueprints scattered everywhere, some even lit in flames (most likely from Natsu). Beakers and other science-y equipment were knocked about everywhere. It seemed like the only thing left untouched was the giant machine in the back of the room….and the hooded figure standing next to it.

"Ice Make: Lance!"

"Requip: Heaven's Wheel Armor!"

Attacks from Erza and Gray flew towards the figure at blinding speeds. Suddenly, just before the attacks hit the figure, he vanished; making their attacks hit the machine behind it. Gray and Erza were surprised.

"Huh? Where did he go?" exclaimed Gray.

"He must have some kind of magic that allows him to teleport from place to place like Mest." Erza noted.

Lucy tightened her hold on her keys. She was terrified. They were up against someone that could defeat Natsu in less than a minute. Even though Gray and Erza were with her, she didn't know if they could defeat this guy.

Suddenly, the wizards heard laughter from behind them. They all turned around and saw the hooded figure behind them. They all got into fighting stances.

"Who are you?!"

"Well, that seems to be the question most people are asking me nowadays."

"I'll only ask you one more time. Who are you?"

"Well, since the great Titania is asking, I guess you can call me Daku."

"What do you want?"

"Oh, are we playing twenty questions now?"

Erza's grip on her sword tightened. She was getting impatient. But, she knew she had to remain level-headed in order to get some sort of answers. She took a deep breath.

"Why are you here? What's your goal?"

"Well, my only goal was to retrieve this machine. But now that you guys are here, I might throw in a fairy or two."

Gray glared at the mysterious man, "Well, you just forgot about one thing."

"Oh? Well, please tell me what that is."

"No one gets away with hurting a fellow guild member!"

With those words, Gray charged at Daku. He put his hands into his ice-make stance.

"Ice Make: Hammer!"

A large hammer made out of ice crashed into where Daku was standing a few moments ago. Gray spun around and yelled out, "Ice Make: Lance!"

Suddenly, Daku appeared right behind Gray. A small, but audible gasp came from him when he saw the multiple lances flying towards his direction. With no time to teleport away, he took on the attack head on and crashed into the wall behind him.

Gray smirked to himself. He predicted that the attacker would've teleported behind him to catch him off guard. He watched as Erza grab their foe and put a sword up to his neck.

"Now, answer my questions or this will be your last day alive."

Daku said nothing.

"What do you want with Sans's machine?"

"Why don't you ask the scientist himself? He's hiding a lot of things about himself."

"Leave the man out of this. He has done nothing wrong. Now, I'll repeat myself one more time. What do you want with the machine?"

Daku looked down at the ground for a moment before meeting Erza's gaze. He smirked. "Well, I would tell you, but I have to go."

In a blink of an eye, Daku vanished and reappeared next to the machine. Then he put his hands on the machine and it vanished. Then, Daku turned to the wizards.

"By the way, I kind of need to borrow the scientist as well. So, I hope you don't mind."

Then, before anybody could move, Daku vanished into thin air.

Erza's eyes widened. "Gray! Lucy! Happy! We need to get Sans to safety!"

Seeing the situation, Erza, Gray, Lucy, and Happy raced back to the scientist. Erza could only hope that they would get there in time.

But there was something she couldn't get out of her mind.

Right before Daku vanished, she saw a mark on his left hand.

It was pitch black in color, and the design was fairly simple. A circle around a crescent moon that was located in the center of that circle. When Erza saw that symbol, she nearly gasped at what she saw.

No…it couldn't be.

But there wasn't any time to warn her comrades. She would tell everyone once this issue was resolved. But right now, they had a scientist to save.


Erza, Gray, Lucy, and Happy raced (or in Happy's case, flew) to Sans's location. When they got there, they gasped at the sight they saw.

Furniture was thrown around everywhere in the room. It looked like a tornado had come in and wreaked the place. There was also a suspicious Daku -sized hole in the wall. But that wasn't the strangest thing in the room. For some reason, the only thing in the room that wasn't touched was the couch Natsu was lying on, but no one was complaining.

After taking in the current state of the room, the wizards' stunned gazes drifted to the people who were standing in the middle of it. Daku was in a battle stance and had an angry expression on his face as he faced Sans. The scientist himself seemed calm. His hands were in his pockets of his lab coat and his posture was one of casualness. He even still had his ever present grin on his face. As they took in the scene in front of them, Lucy spoke up.

"Okay, what the heck is going on in here?!"

Erza analyzed the scene in front of her. "It seems like Sans and Daku has engaged in a battle with Sans currently winning right now."

"How is that even possible?! Unless Sans has some kind of powers, he would never beat Daku!"

Gray nodded in agreement. "That's true. But, I didn't sense any magical energy coming from Sans when we first met him. It should be impossible for him to be a wizard."

Erza was about to speak up when a shout came from one of the two individuals in the room.

"Shadow Ball!"

The wizards looked in surprise as a ball of darkness flew towards Sans. But, while keeping his laid back stance, Sans simply stepped to the side and dodged the attack. The wizard's jaws nearly dropped to the floor.

Lucy gasped in surprise. "How…that attack was so fast! How did Sans even dodge it in the first place?!"

"He has to be a wizard! There's no other way he would be able to dodge that attack!" Happy exclaimed.

"He also must be a very talented one if he could go up against a wizard like Daku." Erza noted.

The Fairy Tail wizards watched in awe and in shock as Daku kept launching attacks at Sans only for him to dodge every single one. It was defiantly a sight to see. Then, Lucy noticed something.

"Guys, have you noticed that Sans isn't using any offensive attacks at all?"

"He might not have any offensive attacks." said Gray.

"But how's he going to win then?! Plus, you can tell he's tiring out!"

Lucy nearly smacked herself for not noticing it before but, when she looked closer, she could see the sweat dripping down Sans's face. She could see his movements become slower and more sluggish. In all honesty, she was surprised that Sans had lasted that long against Daku. Lucy wasn't sure that even she could survive that long. It was very impressive.

Erza frowned. "You're right Lucy. He can't win. I don't think he can last much longer. We must help him."

As soon as Erza said those words, she reequipped into her armor. But, before anyone had a chance to help Sans out, Sans himself spoke up.

"heh…you're really tiring me out buddy. i guess i should end this thing soon. but, before i do, i got a question for you."

Suddenly, the Fairy Tail wizards watched in shock as Sans's eyes turned pitch black. It was like an dark, endless void had replaced his eyes. They could all feel the atmosphere around them change. Though they weren't at the receiving end of Sans's gaze, they could still feel fear from that one change in Sans.

Lucy shivered as she wrapped her arms around herself. "He's so scary all of a sudden…"

Gray pointed at Daku. "Look at Daku now. He's shaking."

Lucy turned her gaze towards Daku and saw what Gray pointed out. He was visibly shaking and there was obvious fear in his eyes. Suddenly, a blue light appeared in Sans's left eye which made him look more sinister than before. Then, Sans snapped his fingers and two giant canine skulls appeared in the behind him. Lucy gasped, but it wasn't because of the skulls that appeared.

Right when the skulls appeared in mid-air, Sans's form flickered. Suddenly, in Sans's place, was a skeleton. Rather, Sans himself had become a skeleton. Everyone could only stand there in shock. Suddenly, everyone was shaken out of their daze when Sans spoke with a low, threatening voice.

"do you wanna have a bad time?"

Suddenly, the skulls behind Sans opened their mouths and fired a blinding beam of light at Daku. Daku just stood there in stunned silence as the beam of light hit him and knocked him into the wall of Sans's house. Daku hit the wall with a loud thud. Everyone watched to see if he would get up.

He didn't.

Sans took a sigh of relief as he snapped his fingers and let his blasters dissipate. Then, he turned around to face the gobsmaked wizards behind him. They all had various range of shock on their faces. Sans sighed to himself. Looks like he would have to do some explaining. And here I was thinking that I would have no work today…

"so, i guess you guys have a skele-ton of questions for me."

The wizards didn't even register the pun. All they could do was nod in shock.

"welp, wake up your pink haired friend and take a seat. this might take a while."


Author's Note:

Disclaimer: I do not own Fairy Tail or Undertale.

Aaand before you say anything, I said all would be revealed later, not next chapter. But, there will be explanations in the next chapter. I think so anyways. Depends on what my brain tells me to write.

Anyways, sorry if this chapter seemed kinda poorly written. Fun fact, this was originally going to be two separate chapters. But the chapters were kinda short so I combined them into one big chapter. Because of that, I had to delete a bunch of stuff and change the transitioning and everything. I also somehow ended up rewriting some of the parts in the chapter because of that too.

So yeah. Sorry if this chapter seemed kinda bad. But hey, at least you got some action.

So, see ya next time!