Chapter 1: The Beginning

A long time ago, there was a Mad Titan called Thanos. He comes from a planet called Titan to seek the six singularities of the universe: The Infinity Stones. Each colored stones grant unlimited power and can even wipe out half, if not, the entire universe with a snap of a finger. There are six of them in total: Power, Reality, Space, Soul, Time and Mind. After a decade searching for the stones, Thanos has finally obtained all six of the Infinity Stones and starts conquering the universe. However, there was one man who stands in his path: Adam Warlock! Adam has managed to assemble Earth's mightiest heroes in his side and after a very long battle, they managed to defeat Thanos. After the battle, Adam decided to send the 6 stones throughout the multiverse in hopes that no one will ever get their hands on it again. But little did he know, one of the Infinity Stone remained in the Marvel Universe...

New York City

The city of New York was really beautiful at hindsight, until you realize that the city is brimmed with criminals. We see a robbery happening in the nearby bank as the robbers went in and take all the money they can find. Until, someone thwarted their heist.

"Hey, haven't you all learned a lesson yet?" A mysterious voice can be heard inside the bank.

"Who's there?" One of the robber asked.

Then, all of a sudden, one of the robbers has been sent flying towards a wall, complete with what seems to be webs surrounding the robber.

"W-What is this? Webs?" The robber said as he tries to get out of the web.

"Bingo!"

Then, we see Spider-Man coming from the top of the bank while upside down.

"Seriously, how many of you robbers are there?" Spider-Man asked.

Suddenly, one of the robbers attempt to shoot Spider-Man, but he quickly dodged it thanks to his Spider-Sense and then retaliated with a kick to the face, knocking him out. The remaining two all charged towards him, but again, he quickly dodged them and knock them out.

"Ah, nothing feels more satisfying than to beat the crap out of criminals." Spider-Man happily said.

He then proceeds to encased them in webbing and hang them upside down for the police to pick them up.

"Alright, now that's done, what's next?" Spider-Man asked.

But then, his Spider-Sense suddenly picked up something...

"Well, I guess there's more crime-fighting toady." Spider-Man said before swinging away.

Then, we see Doctor Octopus wrecking havoc across the city, destroying everthing in his path.

"Hahahaha! You will all soon witness the might of Doctor Octopus!" He exclaimed.

"Well, well, if it isn't my favorite Octodad!"

Doctor Octopus looked up and saw Spider-Man in one of the buildings.

"Spider-Man!" Doctor Octopus said with anger.

"So, still destroying the city with those metallic tentacles of yours? That's getting old, you know." Spider-Man said.

"I've had enough of you and your stupid jokes! It's time to wash the spider away!"

Doctor Octopus starts off by using his metallic tentacles to attack Spider-Man, but he managed to dodge all of them, one by one.

"Seriously, that's your way of washing me out? I think you need your brain to be fixed." Spider-Man taunted him. "Oh, wait, you don't have to. 'Cause I'm gonna do it for you!"

Spider-Man attacks him in quick succession, but the Doctor managed to caught him while attacking and sent him flying into a building.

"Well then, I guess those metallic tentacles aren't just for show." Spider-Man said as he gets up.

After flunging him away, Doctor Octopus moves on, looking around as if he's finding something. He took out what seems to be a radar.

"Hmm, according to my radar, the stone should be around here somewhere." Doctor Octopus said to himself.

Then, he starts wrecking building in order to find the stone until he stumbles upon a jewelry store. He took out the device again and it beeps, indicating that the stone is inside.

"Bingo." Doctor Octopus said with a smile.

He then searches through the store for the stone until he finds a glowing red stone. It turns out to be the Reality Stone, one of the six Infinity Stones.

"Hahahaha! At last, the Reality Stone is mine!" Doctor Octopus said with joy.

But then, out of nowhere, Spider-Man attacked him, sending him into a wall.

"Seriously, Ock, a jewelry store?" Spider-Man asked. "What, you're looking for diamonds or something?"

"That's none of your concern, web-crawler!"

Doctor Octopus once again attacks Spider-Man with everything he got. But thankfully, Spider-Man managed to dodge all of his attack and used his webs to tie his metallic tentacles up, leaving him immobilized. He also dropped the Reality Stone but Spider-Man didn't noticed it. Few minutes later, we see Doc Ock getting arrested by the police while Spider-Man observes idly.

"Damn you, Spider-Man! I will have my revenge!" Doctor Octopus yelled.

"Maybe not in a million years, Doc." Spider-Man retorted.

After getting him inside, the police departed to take him back to the Raft. With the job done, Spider-Man was about to swing away, but he noticed something glowing in the store.

"What was that?" Spider-Man asked to himself.

He inspected the store and there he finds the Reality Stone lying around.

"Wait is this...an Infinity Stone?" Spider-Man seems shocked upon seeing the stone. "I thought Adam sent them through the multiverse."

Nevertheless, he keeps the stone because if he left it there and someone were to find it, it would cause a disaster.

"This can't be good! I better tell Dr. Strange about this." Spider-Man thought.

And with that, Spider-Man swings his way towards the Sanctum Sanctorum to inform Dr. Strange.

Fuyuki City, Japan

In the multiverse lies a world where mythological legends are reborn to partake in a war for the Holy Grail. Many people called this the Holy Grail War and it already began it's 5th incarnation. Somewhere around the city, we see Shirou Emiya and his Servant, Saber as they witnessed Berserker attacking people.

"What's Berserker doing in here?" Shirou asked.

"I do not know, but I must stop him from harming the innocent!" Saber answered.

"Right. I'll go and find it's Master."

Shirou left the area to find Berserker's Master while Saber decides to attack him head-on with her invisible sword. And thus the battle between the two powerful Servants has begun. They started off by clashing their respective swords with one another and then Saber starts dodging his attacks.

"Not bad, for a Berserker." Saber complimented his skills. "But you're gonna need more than brute strength to best me!"

After dodging a lot of Berserker's attacks, she starts attacking him but to her surprise, he managed to block it with his weapon. He grabs her by the leg and throws her away. Saber gets up and starts attacking him again, but he still blocks them all. That is until, she caught him off-guard and slashes him in the chest, causing him great pain.

"I gotta admit, you're a pretty powerful Servant." Saber said to him.

But then, Berserker suddenly glows red aura around him, shocking Saber.

"What?"

Berserker suddenly attacks Saber, but she managed to block his attack, though she was pushed back in the process.

"What power!" Saber was amazed by Berserker's sudden boost in power.

Saber tries to attack him with Strike Air, revealing her sword in the process. But, for some reason, Berserker was not fazed by this attack and sends her flying.

"How is he able to survive from Strike Air?" Saber asked to herself as she gets up.

But before she would attempt to attack Berserker again, she noticed a purple glowing stone floating besides her. The stones turn out to be the Power Stone!

"A gemstone? What's it doing here?" Saber wondered.

She sensed Berserker coming this way, so she decided to take the stone with her and resumes fighting against Berserker. But, suddenly, she glows purple aura around her as she tries to attack him. This time, Berserker was overwhelmed by Saber's attack and was blown away. Saber was shocked that he gain such power all of a sudden.

"Had enough, Berserker?" Saber asked the downed Berserker.

Berserker gets up and was about to attack Saber once again, but his Master, Ilyasviel, came in.

"That's enough, Berserker!" Ilya ordered.

With that order, Berserker stopped in his tracks as Ilya approached him.

"We're going home." Ilya told him. "But next time we meet, we will defeat you, Saber!"

And with that, Ilya and Berserker fled the scene. Saber can only watch as they walk their way home.

"How was I able to overpower Berserker? I could barely scratch him." Saber asked to herself.

But then, something glow within Saber. She picked it up and it turns out to be the same purple stone she picked up earlier.

"Could this gemstone be the source?" Saber wondered.

"Saber!"

Shirou came to Saber's aid as she pocketed the stone.

"Shirou." Saber said.

"Did you do it? Did you beat Berserker?" Shirou asked.

"No, he and Ilya just ran away." Saber answered.

"Well, it's been a day. Let's go home, Saber." Shirou said.

"Yeah..." Saber nodded in agreement.

And with that, both Shirou and Saber decided to go home and rest for a day.

City of Vale

In another part of multiverse, there was a planet called Remnant. The similarities between this planet and Earth are uncanny. The inhabitant of this planet are humans and faunuses, humans with animal-like traits. In the outskirts of the city, we see Team RWBY looking for something.

"Uh, what are we supposed to look for again?" Ruby asked her teammates.

"We're looking for an orange gemstone that said to be around here." Weiss answered.

"Professor Ozpin said that the stone might contain a dangerous power." Blake added.

"So, what if it's dangerous? It's just a gemstone! It can't be that bad, right?" Yang said.

"I don't know..." Weiss could only shake her head. "But all we know is that we have to get it before someone else does."

"Then let's find that gemstone!" Ruby declared.

And with that, Team RWBY searched valiantly for the orange gemstone until they stumble upon a cave.

"What's a cave doing around here?" Yang asked.

"I don't know, but if that orange gemstone is inside that, then we have to go inside." Blake answered.

"Well, let's go inside, I guess." Ruby said.

"But remember, we must stick together. Who knows what awaits us in this cave." Weiss told them.

Team RWBY proceeds to go inside the cave, with Ruby carrying a torch to help them navigate the darkness of the cave.

"Wow, it sure is dark around here." Ruby commented.

"Well, duh, it's a cave!" Weiss stating the obvious. "Have you ever seen a cave that is not covered in darkness?"

"Let's just keep going." Blake told them.

They continue to navigate the cave to search for the gemstone. Until they finally found a room with the orange gemstone in it. Upon closer inspection, it turns out to be the Soul Stone

"That must be it. The orange gemstone." Weiss pointed.

"Well, that was fast." Yang said.

"Yeah, never thought we'd find it in minutes." Ruby added.

"Wait, something's coming."

Then, a bunch of Beowolves suddenly appeared out of nowhere, seemingly guarding the stone.

"I knew we would ran into them eventually." Blake said.

"Well, if they're guarding the stone, then we just have to defeat them!" Ruby said as she and her team prepared their weapons.

Team RWBY starts fighting off the Beowolves that are guarding the Soul Stone. It seems that they got the upper hand as they were able to beat them, one by one.

"Phew, we managed to beat them." Yang said.

"Let's not waste time here! We're gonna get that stone and-"

The stone suddenly glows and more Beowolves appeared out of nowhere.

"What, there's more of them?" Weiss was surprised.

"We need to get the stone and get out of here!" Blake said.

"I got it!"

Ruby used her Semblance to pass through the Beowolves and obtains the Soul Stone.

"Wow, it's very shiny..." Ruby awed as she looked at the Soul Stone.

"Ruby, did you get the stone?" Weiss asked.

"Uh, yeah. I got it!" Ruby shouted.

"Good. Once we beat them, we need to get out of here and fast!" Weiss told them.

Ruby joined her teammates in destroying the remaining Beowolves that stand in their way.

"Alright, let's get outta here!" Ruby told them.

"Right!" All three of her teammates nodded.

Team RWBY rushed to the exit of the cave, but suddenly, it was blocked by an Ursa, with Beowolves assisting it.

"Oh, great. The big guy has to show up!" Yang said.

"Well, I guess we have one more obstacle before we could get out." Weiss sighed.

"Alright, I'm all pumped up!" Yang said as she clenches her fist. "Let's do this!"

Once again, Team RWBY chose to fight them instead of going towards the exit. It's a good choice anyway since if they go for the exit, the Grimm will surely come after them and presumably the stone as well. Anyway, we see Ruby and Weiss teaming up to take down the Beowolves while Blake and Yang deal with the Ursa. The battle was really intense, with Team RWBY doing their hardest to take them down. And they did, after a few minutes.

"Alright, now that they're out of the way, let's make it to the exit!" Ruby told them.

And with that, they finally managed to get out of the cave unscathed.

"Whew! I thought we're gonna be stuck in there!" Yang sighed in relief.

"Well, all that matters is that we got the stone and managed to get out safely." Weiss said.

"So, Ruby, where's the stone?" Blake asked her.

"Oh, it's right here." Ruby said as she showed the Soul Stone to her teammates.

They looked in awe at the stone as it began glowing of it's own.

"Wow, I've never seen a stone like this in my entire life." Weiss commented.

"It's really shiny, isn't it?" Ruby asked.

"Yeah, makes me wanna sell it for money!" Yang answered.

"Woah! We're not gonna sell this stone, Yang!" Ruby shouted.

"I know, I was just joking!" Yang reassured her.

"Well, let's go back to Beacon and have Professor Ozpin inspect this stone." Blake told them.

And with that, Team RWBY decided to go back to Beacon and give the stone to Ozpin for inspection.

A/N: And we have the first chapter of this multi-crossover fanfiction. Now, there's one thing I'd like to get out of the way: Despite the fact that I used the term "Infinity Stone", this fanfiction is not connected to the Marvel Cinematic Universe at all.

Anyway, the next chapter will cover the worlds of DC, King of Fighters and Street Fighter. So, stay tuned for that.

I hope you enjoy this multi-crossover fanfiction and I'll see you guys in the next chapter!