Here's the sixth chapter. Enjoy!

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

Dragons? Nothing new. Three members of Fairy Tail were raised by them.

Demons that were made by the black wizard Zeref? Unsurprising. She had seen one with her own eyes.

However, ten foot robots? That was new.

When the floor beneath them exploded, Erza suddenly found herself right at the edge of the hole the explosion had created along with her comrades and Sans. He had turned into his skeletal form and his eye was glowing blue. He must have used his abilities to bring us here…

That was when the giant robot burst out of the hole. The Fairy Tail wizards gasped at the sight of the robot. Erza thought she heard Sans mutter something like, "that's one big version of mettaton." She decided not to say anything.

Suddenly, Gray shouted something. "Erza, MOVE!"

Erza responded to Gray as she instinctively leapt to the left. She landed in a crouch and looked to see what Gray was yelling about. Then, her eyes widened as she saw the equally giant knife the robot was wielding. The knife swung towards her with speeds that should've been too fast for the robot of that size to handle. Erza leapt over the knife and landed away from her friends.

Then, the robot seemed to change its attention to the larger group of people. It swung its knife at them. The Fairy Tail wizards leaped in all different directions to avoid the knife. Sans simply teleported off to the side.

Sans gazed up at the robot. It honestly did look a lot like Mettaton. But, as he looked closer, he could see a figure at the top controlling the robot. Guess it's a remote controlled Metts then…

"guys! there's someone controlling the bot!"

Lucy glanced up and saw what Sans was talking about. At the very top of the robot was a dome made of black-stained glass. But, if she squinted, she could see a figure inside the dome. She knew what they had to do. "Guys, shoot the top of the-"

A voice cut her off. "Hey there sweetie, I don't think you should do that."

Lucy whirled around and saw a red-haired girl wearing clothes made of…mist?

Lucy rubbed her eyes to make sure she was seeing correctly. A girl was wearing a dress made out of red mist. Luckily, the mist was thick enough so you couldn't see her body. On her left forearm was the mark of Midnight Barrem.

Of course, the color of it was red.

The girl was examining her red-painted nails carefully. Without looking up, she said, "So, are we going to fight or not?"

Lucy snapped out of her daze and grabbed one of the keys off her belt. "Open: Gate of the Golden Bull! Taurus!"

"How's it going Miss Lucy? You're still a beautiful as ever!"

Lucy rolled her eyes at Taurus. He was still perverted as ever. "Ugh, attack that girl wearing that misty-dress!"

"Anything for you Miss Lucy!"

Taurus swung his axe at the girl. She just smirked as the axe went through her.

Taurus's eyes widened. "Huh?"

Then, the girl flicked her wrist and a stream of red mist went flying into to Taurus's nose. Immediately, Taurus fell to the ground. His hands started clawing his neck. He gasped loudly before turning pale. He muttered weakly, "Miss Lucy…"

Lucy gasped out loud. She immediately recalled Taurus. She glared at the girl in front of her. "What did you do?!"

The girl just smiled mischievously and raised an eyebrow. "Oh? That was my magic. Mist Magic. It's pretty don't you think? After all, red is the color that people bleed."

Lucy glared at the girl. She could feel anger bubbling up inside of her. That girl had just hurt Taurus and smiled about it.

Hmm…if she's anything like Juvia, then magical attacks should work on her….

"Open: Gate of the Lion! Loke!"

"What may I do for you today Lucy?"

"Use a magical attack against her!"

"Sure thing."

Loke then rushed towards the red-headed girl. "Regulus Impact!"

But, as soon as Loke shouted his attack, the girl glanced up and calmly said, "Mist Barrier."

Suddenly, a misty red barrier surrounded the girl. Loke hit the barrier with his attack. He fell backwards and glanced up at the barrier.

There wasn't even a dent in the place he hit it.

"Are you okay Loke?!"

"I'm fine, but this girl is stronger than she looks."

Loke turned his attention towards the barrier. "Maybe we can-"

Loke was suddenly cut off as he heard a scream from behind him. He whirled around and saw a misty tentacle had wrapped Lucy around the legs and was dangling her upside-down in the air.

"Lucy!" Loke yelled out worriedly. He looked up and saw Lucy trying to pry herself out of the tentacles. But, whenever she touched them, her hand would go through them.

Loke gritted his teeth. He leapt in the air and yelled out, "Regulus Impact!"

But before he could hit the tentacle of mist, another one came flying towards him from the side. Loke changed directions and quickly landed back on the ground.

He glared at the tentacles. It looked like this was going to be a tough one.

Gray gazed up at the big robot. If he squinted, he could see the figure running around in the dark dome at the top. If that person was controlling the bot, then it was obvious that he needed to take out that person. He put his hands into his Ice-Make stance. "Ice-Make-"

"I wouldn't do that if I were you."

Gray whirled around. The dark- haired man in front of him was wearing a classic black suit with a red tie. He had dark shades on and a navy blue Midnight Barrem mark on the side of his neck. Gray gritted his teeth. So here's one of the guys responsible for this…

Gray analyzed the man in front of him. He didn't look like he was going to attack but, Gray knew that looks could be deceiving. He wanted to attack him but, he was a member of Midnight Barrem and, Gray knew they had very powerful members. Gray also had no clue what type of magic the man could do. He sighed. The odds were really stacking up against him.

The man spoke in a smooth voice. "Interesting, out of all the opponents I've faced, you are the first one that hasn't tried to attack me head on. You must be wiser than the others."

Gray decided to get as much information on him before he attacked. "Who are you?!"

"Me? Oh forgive my manners. I am Tekishita. Now, may I ask who are you?"

Gray decided there was no harm in giving the man his name. "Gray. Gray Fullbuster"

"So Gray Fullbuster, I can tell you're a mage of Fairy Tail. But, here's some advice for the future, if you want people to know that you're from Fairy Tail, just tell them; no need to strip."

Gray looked down in surprise. "Oh come on! When did this happen?!"

Tekishita rested his hand underneath his chin. "Hmm. Mages of Fairy Tail are usually known for their brute strength and the trouble they cause. However, you seem different. You seem…smarter. So, in that case, instead of testing your strength, we're going to do something a little different."

Tekishita snapped his fingers. Suddenly a table and two chairs appeared in front of them. The man sat down in one of the chairs. When he saw Gray hesitating he sighed. "What are you waiting for? Take a seat."

Gray cautiously took a seat. He stared at the man in front of him. He had no clue what Tekishita was playing at.

"Hmm…oh yes of course."

Tekishita snapped his fingers again. Suddenly, a deck of cards and some poker chips appeared on the table.

Tekishita leaned forwards and stared intently at Gray. "So Mr. Fullbuster, instead of fighting, we are going to be playing some poker. Winner gets to kill off the other person. Deal?"

Gray looked down at the items in front of him. He remembered playing a couple of games of poker with Wakaba and Macao when he was younger. Of course, he lost all of the games (and his money).

Afterwards, Cana had told him that he was playing it wrong and Wakaba and Macao had scammed him of his money. Gray had gotten pretty mad afterwards. The next day, the mages of Fairy Tail had entered and saw a frozen Wakaba and Macao.

Of course, a few years later, Gray had properly learned how to play poker and won against the two.

But, as Gray stared down Tekishita, he thought about what to do. Gray himself was good at poker. He had beaten everyone in Fairy Tail save for Cana; Gray was pretty sure she cheated every time she played against him. And, he wasn't sure of Tekishita's strength. However, these were Tekishita's items so there was no telling if they had magic in them or not. Plus, Tekishita had an aura that radiated intelligence.

Gray considered the pros and cons of the situation at hand. Then, he made his decision.

"I accept your deal."

Tekishita smiled in delight. "Really? This is the first time I've played against an enemy. I'm excited."

Tekishita shuffled the cards before dealing them out. He glanced up from his dealings. "By the way, good luck. You'll need it."

The two stared each other down. With everything that was happening, Gray was sure he needed the luck.

He needed a lot of it.

Erza was getting annoyed.

This was the twentieth arrow that she had blocked with her sword and yet she wasn't getting any closer to figuring out where they came from.

Suddenly, she heard a whoosh go past her ear. Erza immediately whipped around and threw her sword in the direction the arrow came from.

She knew she hit her target based on the groans of pain that came from that direction.

Erza ran towards the direction of the groans. As she got closer, she could hear some muttering.

"Damn…how'd she get me? Well, I guess she's called 'The Queen of the Fairies' for a reason."

As Erza burst into the area, she saw a young kid lying on the ground. She frowned. Why would Midnight Barrem have a kid working for them?

The kid stopped groaning and looked up. Erza could now see his features clearly. The kid looked no more than thirteen and had dirty-blond hair with piercing blue eyes. His face was set into a scowl. Erza could see the edges of a purple Midnight Barrem mark on his bicep, partly covered up by the t-shirt he was wearing.

The kid sprung up from his position on the ground. Suddenly, a bow notched with an arrow appeared in his hand. He glared darkly at Erza. "Move and the last thing you'll see is the tip of my arrow."

Erza decided to ask a question. "Why are you helping Midnight Barrem? You're just a kid. You don't have to go down this dark path."

The kid continued glaring at Erza. "Hmph. It was because of you folks that my life got started on this path."

"What do you mean?"

"Why should I tell you?! You guys wouldn't do anything to help anyways!"

"How would you know?"

"Are you always this nosy?"

Erza frowned. This kid was getting a bit annoying. "I just want to-"

"They all say that!" he spat out. "But once they hear the truth, they suddenly can't do anything about it. And the ones that do try to help, they end up dying. So no, you can't help me. None of you can! Midnight Barrem took me in, treated me right. Unlike you 'light folks' who proclaim that you're 'all good and mighty'."

Then, in a fit of rage, the kid released his arrow at Erza. In a flash, she quickly summoned her sword and blocked it. Then, she gasped.

The area where the arrow hit the sword was dissolving. Erza quickly let go of her sword. A few moments later, the whole sword had turned into ash.

The kid gave her a dark smirk. "You like it? That's my magic, Arrow Magic. I can summon arrows that do anything I want."

If it was anyone else, Erza would've attacked them immediately and beat them into submission for ruining one of her swords. However, the kid reminded her of…herself.

When Jellal had forced her to leave the Tower behind, she thought no one could help her. She thought she was alone.

She sensed the kid felt the same way. She knew where he was coming from.

So, instead of attacking, Erza gave him a small smile. He frowned, obviously confused. Erza chuckled a bit. "You know, you remind me myself when I was young."

"I do?"

"I had a….friend who forced me away. He had turned evil. I thought no one could help me. I thought I was alone."

The kid frowned and said, "I don't want to hear your stupid story. You're nothing like me and I don't need your worthless pity."

With those words, he quickly notched an arrow and sent it flying towards Erza.

Erza gritted her teeth and rolled to the side to dodge the arrow. It looked like it would take more than a few words to convince the kid to stop fighting.

"Fire Dragon Roar!"

A billow of flames came flying out of Natsu's mouth and at the robot. The robot brought its knife up and blocked the flames.

Suddenly, a blue beam of light hit the backside of the robot. The robot turned around and shot a plasma beam from its cannon at the shooter. Sans dodged the beam.

Sans looked up at the bot. His beam hadn't done much damage to the bot other than a scratch on the surface. Natsu's attacks weren't having much effect either. Between the two of them, the only thing they had accomplished were multiple scratch marks on the robots' exterior.

He and Natsu tried damaging the glass dome itself, but the glass wouldn't even crack no matter how hard they tried. After that, they resorted to destroying the actual body of the robot itself, but they weren't having much luck with that either.

Sans took a shortcut that landed him right next to Natsu. He heard him say, "Ugh! He's getting me all fired-"

"hey bud, no need to get so hot-headed over this. i understand this is getting you all fired up, but we gotta think this through or we're gonna end up toast."

Natsu whirled around in surprise. "Gah!" Then, he quickly realized it was Sans. Natsu suddenly narrowed his eyes in suspicion. "Hey..weren't you on the other side a few moments ago? How'd you get here so fast?!"

Sans gave his signature wink. "i took a shortcut." Then, Sans got serious. "look buddy, we can't just keep attacking the bot like this or we'll just tire ourselves. we need a plan."

Natsu knew Sans was right. The fight had been going on for a while and he could feel his magic energy starting to deplete.

"What do we do then?" Natsu questioned.

"I'm not sure.." Sans muttered to himself as he dodged a plasma beam. He really wished the bot was Mettaton. Then all he had to do was flip the switch on his backside to turn him into his alternate-but-easily-defeatable form. But, the bot he was currently facing had no such switch. Sans sighed. Without the extra magic in the air giving him a boost, he would've been tired out by now. But, even with the extra boost, Sans could feel himself getting fatigued.

"if only our attacks were stronger.." muttered Sans.

"I got it!" yelled Natsu suddenly while leaping over the swinging knife.

Sans teleported away from the knife's path before turning to Natsu with a bit a surprise. From what he could gather, Natsu was the type of person that used their fists, rather than their brains. So, it came to a bit of shock when Natsu said he had a solution.

Natsu grinned at Sans. "I have a way to make our attacks stronger."

Sans was surprised. How did he hear- oh yeah, Dragon Slayer Magic.

At Sans's expectant look, Natsu continued talking. "Let's perform a unison raid!"

Sans's expression performed the equivalent of an eyebrow raise as he summoned a wall of bones to block another plasma beam. "a what now?"

"You know, a unison raid? Where two people combine their magic and end up having really strong attacks?"

"….have you actually done one before?"

"Well…no. But Gray and Lucy have done one before! I've seen it work!"

Sans thought about this 'unison raid' for a moment. He wasn't sure if his magic would be compatible with someone else's that was from another universe but, he knew that he and Natsu were wearing out and had to defeat this robot quickly. Sans shrugged to himself; why not try it out? What was the worst that could happen?

Sans gave Natsu his nod of approval. Natsu excitedly punched a fist in the air.

"Let's do it! We're gonna perform a unison raid!"

Author's Note:

Disclaimer: I don't own Fairy Tail or Undertale

Hmm..so Natsu and Sans are gonna perform a unison raid? This is defiantly not gonna end well...

Anyways, I hope the enemies are well written. I tried to make them Fairy Tail style. (You know, extremely powerful enemy that they fight for like the whole arc and then defeat them somehow at the end? Yeah, those enemies.) If you don't like them, (or just don't like OC's at all) just keep in mind that I only made them to keep the plot going because there's gotta be some action right? Other than that, they're just pretty minor characters.

By the way, is it just me or has anyone else noticed that half of the time, Gray wins his fights by using his brain instead of sheer force? Like, Ultear for example. She has time magic so what'dya do? You freeze your own blood. Or how bout' Rufus Memory magic? Just perform the spells faster than the human eye can register. Of course, he doesn't always win with strategy. 1/4 of the time is actually brute force. The other 1/4 is because the enemy falls in love with him.

Anyways, that's why I had Gray thinking about how to win instead of fighting.

So, hoped you enjoyed this slightly longer than usual chapter. (Seriously, this chapter, not including this author's note, is like nearly 3,000 words. That's impressive for me.)

Till next time!