It has been 5 years, 5 years since the end of the Human-Covenant war and 5 years since the Master Chief enter in cryogenic sleep in the wreckage of the frigate known as the 'Forward unto Dawn'. In this long time the A.I.Cortana, one of the Chief's last friends alive, had been watching her friend while trying to find a way to contact any allied forces for rescue but to this date she had been unsuccessful and if it wasn't the last of her worries she had to pass through rampancy but in the end she was able to survive it and reach metastability. In the end it means she will live long enough to see her friend being rescue if they were lucky enough.

- Inside the Dawn's cryo bay-

Cortana could only sigh in boredom, she had been expecting that someone had already find them but it had not be the case, besides it was extremely boring to not have no one to talk. She knew that she could have woken up her friend and talk to him just to kill the boredom for a time but honestly it only would have been a waste of time for the two. Cortana then sighed once more and proceeded to do a fast scan of the area but then something caught her attention. It was some kind of anomaly that was giving high energy readings and the Dawn was about to enter its gravity well, Cortana then weighted her options and decided that leaving the Dawn was the best course of action, she then started the procedure to wake up the Chief from his cryogenic sleep.

"Chief wake up, I need you." She said while looking at her friend's form being unfrozen.

When the Chief was finished being unfrozen he woke up with a start slamming his hands in the door of his cryogenic chamber until he remember where he was and the he heard Cortana tell him "Easy John, you just woke up from cryo sleep." Then the artificial gravity returned to the ship and shortly after Chief's cryo pod opened allowing the Chief to go out.

"Cortana, what is going on?" The Chief asked.

"Well I have only bad news for you. First, it had passed 5 years and no one has found us yet. Second, we are nearing an anomaly and I don't have any idea of what it is and I don't want to take any risks with it." Cortana answered.

"What do you propose?" Chief ask.

"I recommend we take any supplies we need and use an escape pod to get off the Dawn before it enters the in the range of the anomaly's gravity well. With some luck we may stumble with a ship of the UNSC or the Covenant separatist before we ran out of supplies." Cortana said.

"How much time we have?" Chief ask.

"Not much at best an hour and a half." Cortana said.

"Then we don't have any time to lose." Chief said while grabbing Cortana's data chip.

-Some time later-

The Chief had already loaded in an escape pod a great quantity of supplies in the form of food, water and medicine. Right now he was in the armory grabbing some weapons in the case he needed to defend Cortana and himself, to be more exact a sniper rifle, an assault rifle (AR) and a magnum. He was about to return to the escape pod when the ship rocked violently, making the Chief almost lost his footing.

"Cortana what is happening?" Chief ask.

"Chief the anomaly is starting to gain strength and we will enter its gravity well earlier than anticipated." Cortana said clearly worry for the situation in which they were.

"Then we better get out of here." Chief said while putting his weapons in the magnetic plates of his armor and running in the direction of the pod.

The moment he enter he took the controls of the pod and launch it as fast as he could but when it look like they were going to escape the pod shook violently.

"Cortana?" Chief said confused and worry of what is happening.

"Chief, the anomaly's energy has skyrocket and its gravity well strength has increased, we can't escape from it." Cortana said.

"Anything we can do?" Chief asked.

"Aside from waiting until we reach the anomaly, no nothing. Chief if we don't make it, it was pleasure working with you." Cortana said.

"Likewise." Chief said.

When the pod reached the anomaly a white light washed up on the two, not even when the Chief's helmet polarize itself was enough to stop the blinding light that wash over them, then darkness surrounded them.

-Inside escape pod, unknown time, unknown place-

The Chief started to open his eyes at the reproduced sound of someone hitting glass by Cortana and said A.I. calls telling him to wake up.

The Chief started to stand up and grabbed his armored head feeling a headache the size of a Halo ring and said "Cortana, what happen?"

"Well, first and most obvious we still alive, second we are I am unable by the moment to tell you where are we and last and maybe most important and please try to do anything rash but have you notice if anything is wrong with you?" Cortana said.

"What do... you… mean?" Chief said stopping between words realizing that his voice sounded different but the sound wasn't foreign to the Spartan in fact he remember it quite well it was the sound of his own voice but when he was 14 years old he then took off his helmet and took a look at his face in the closest surfaces that could reflect his own image his face look just like when he was a teenager to be more precise when he finish receiving the augmentations and he was smaller (But still unbelievable high compared with most people in their fourteen). All in all, the Chief was again in his 14.

The Chief had seen many things in his long military career, the Covenant, the death of many of his Spartan brothers and sisters in arms, the Halos and other Forerunner related installations, the Flood, etc. but this sight of himself in his 14 instead of his 40s takes the cake. He then did something no one would expect from a Spartan super soldier and that was slamming his head against the nearest wall repeatedly, denting said wall. Cortana didn't know what to say because she had never expected that the Chief will finish doing something like this in few words she was shocked by the actions of her Spartan friend.

Moments later, the Chief stop hitting his head against the wall, put back his helmet and said "Ok, what do we do now?"

Cortana getting out of her temporally shock she said "Well I had found that the 'Dawn' is not very far away from our current location and also it looks like this planet is actually habitable."

"Good. Where is 'Dawn'?" Chief asked while he grabbed his weapons and gave them a quick check up before putting them in the magnetic plates of his armor.

"The 'Dawn' is right now 5 kilometers north from our current position; I'll display the coordinates in your HUD" She said.

"Anything else?" The Chief asked while leaving the pod and noticing that they were in the middle of a forest.

"Actually yes, I just recently found signs of civilization on this planet. For the moment we don't have to worry if anyone comes for us we are far away from any major settlement and an another thing that you are not going to believe me." Cortana said

"What?" The Chief said while he follows the coordinates to the Dawn but he felt uneasy; he felt like if someone or something was watching him, he even detect some movement in his motion sensors but whatever it was following him was heavily trying to remain unseen.

"John this people are humans." Cortana said surprising the Chief, then she said "And before you think they are Innies, they have not shown space flight technology and there history of this world indicates that they have grown in this planet since record history."

"You think it may have been the Forerunners doing possible but still there could be other possibilities also there is something that could prove that theory wrong; in this planet there is a human sub-specie known as Faunus and they are basically humans with animals traits like claws, animal ear, tails, etc." Cortana said

"Tell me you are joking" The Chief said while looking through the scope of his sniper rifle trying to find any threats.

"I wish I was but… CHIEF, BEHIND YOU!" Cortana screamed the last part

The moment Cortana said that last part, John's instincts kicked in making him dodge in the last moment a black and white mass that had tried to lunge at him and then he hit said mass with the butt of the rifle launching it several meters and unto its back but the thing recover fast from the Chief's attack and was back on its feet again.

When the thing stood up the Chief now could see that the thing looked like a wolf just that bigger, its fur completely black and with a white bone-looking armor and red glowing eyes and it could stand in its hind legs. The wolf-looking being then roared at the Chief in anger but the Chief didn't even flinch he just look at the being and lined his rifle targeting the mass center of the creature and shoot, the creature was long dead before it even hit the ground but then the Chief heard growling coming from his right side and he was meet with the sight of more of the wolf-like creatures but 5 caught his eye more than the rest; they were bigger, their armor thicker and clearly they were leading the group.

The Chief just stared at them and he changed his sniper rifle for his AR and stood in a ready stance waiting for the creatures to make the first moment.

"Chief I'm counting at least 70 of these creatures, excluding the one that you already killed, and given the odds it doesn't seems like a fair fight." Cortana said but instead of sounding worry she sounded confident in fact she had an evil grin across her face that was shared by her Spartan friend.

"Yeah, for them" Chief said. As in cue the creatures charged at the Chief only for him to start gunning them down without mercy, 7 were dead before they could reach the Chief, one tried to claw at the Chief on the face but he stop it with his AR and then hit it with a kick to the gut launching him against 3 others, other tried charged at the Chief from the side only to be hit with the butt of Chief's rifle, shattering its armored head killing it, the Chief then gave a 180º spin and finish it with a kick that landed in the side of a creature launching it through the air and the Chief remembered that he had some grenades with him and he throw a fragmentation grenade in direction of the creature he hit, the results the creatures with 12 others were blown to pieces, he then recharged his AR shooting the creatures that charged at him while blocking the attacks of the ones that were able to reach him and countering them with precise hits that killed them or that put them out of the fight. The fight was resulting to be a complete massacre then one of the big ones, which the Chief identified as alpha 1, tried to charged at the Chief and tried to claw at his face just to hit nothing and then receiving a hit to the gut that launch against a tree, then another (alpha 2) attacked the Chief only for the Chief to spin to the left and then he elbow the creature in the face cracking its armored face and the Chief spin kick it in the gut launching him against another (alpha 3) that was charging at the Chief, then the Chief charged against the fourth alpha and jump over it while doing a flip and shooting against the alpha with his magnum 3 times and the moment the Chief landed behind it he grabbed it and did a 180º spin putting said alpha in the middle of the attack path of the fifth alpha, who slashed his fellow alpha. Then the Chief kick the alpha 4 against the alpha 5 and in the last moment Chief dodged a claw aimed at his face and backhanded the alpha 1, which the moment it recover from the backhand he stared directly at the barrel of the Chief's sniper rifle and shortly after lose its head. The Chief then used his rifle to stop the attack of the third alpha and then kicked its knee with enough force to shatter it making the alpha fall to the ground face first or that would be the case if it wasn't for Chief who grabbed his magnum and shove it inside the alpha's mouth and shoot three bullets inside the alpha killing it. The Chief then spot the alpha 5 charging at him ready to claw at him but the Chief caught the offensive limb he then lift the alpha over his head and shortly after slam it against the ground and before the alpha could recover the Chief deliver at him a full salvo from his AR, finally the Chief spot the second alpha coming at him, so he grabbed his AR like a club and hit the alpha in the face making it twist its head in an unnatural angle killing it.

The Chief just started at the mess he made until Cortana said "Well, I must admit that was entertaining" Then she notice that the creatures were turning in some kind of smoke "Interesting these creatures starts to turn in some kind of smoke when they die, maybe is a failsafe to stop someone from being able to study them but that will mean that they are not natural and that whoever made this things knew what he or she was doing"

"Is there anything about these creatures?" The Chief ask while reloading his weapons.

"Actually yes, for what I have gather form the local system of communication the people call them the creatures of Grimm or for short Grimm, they have been responsible from stopping local human population from expanding through the rest of the planet but its origins are completely unknown. Right now you just finish fighting the variant known as Beowolves 5 of them being alphas or in other words the strongest of this particular variant" Cortana said.

"Anything else?" The Chief said before giving a 180º spin and throwing his knife which landed between the eyes of a beowolf killing it, to be more precise the fourth alpha.

"Well according to the locals the Grimm feels attracted to negative emotions and that many attempts to colonize outside the boarders of the main countries, or as how the people of this planet likes to call them Kingdoms, have result in complete disaster with almost no survivors." Cortana said while the Chief recovered his knife.

"You said there are more variants. Care to tell me which are they?" The Chief ask while continuing his search for the 'Dawn'.

"The more common variants, aside from the boewolf, are the Ursa which looks like a bear, the King Taijitu which is a giant two headed snake, the Nevermore which are ravens that there size can range from the normal size of a raven to being so big that they could rival a longsword and the Death stalker which are giant scorpions, the biggest could rival a scorpion tank. Those are the most common variants you may face but here are other variants; for example the Goliath which are elephants but several times bigger, fighting one head on is almost consider a suicide in fact they could be considered this worlds variant of scarabs tank just less armored and it only posses close range attacks." Cortana said.

"I'll keep that in mind?" Chief said.

When they arrived to the 'Dawn', the Chief started to think in the situation they were in, the 'Dawn' was trapped in an unknown planet, they were completely alone in a world almost had no knowledge except for what Cortana had already told him and he was return to the age of 14 year old, he really didn't know what to do. Cortana seeing how her friend was lost in what to do decided that it may be a good idea to give him a push in the right direction.

"John, you know this world, for what I have found, needs a little bit of help" Cortana said.

"What do you mean?" He said while taking of his helmet.

"Well this world is pretty messed up, for starters they have to deal with this creatures on daily basis, second the Faunus that I previously mention are treated as animals and they are not going to tolerated it any longer, an example of this is the White Fang; it was original an organization that tried to protect Faunus rights and change the way humans saw but when new leaders took control of the White Fang it turn into a terrorist group that attack that used force to obtain what they want and they are not afraid to hurt even innocents to achieve their goals, in fact it so bad the situation there is the probability of a civil war between humans and faunus and if a war explodes it would only made the Grimms more eager to attack and kill every single human and faunus they found and thirdly crime rate is growing not only because of the White Fang actions but many other criminals and figures in power are taking advantage of people's lack of knowledge or hate that exist humans and faunus to get what they want. John they need someone who actually knows how really the world is messed up and stop it while there still is a chance. They will need someone like you." Cortana said

John only looks at Cortana and sighed and then said "You know this maybe your craziest idea ever but you right, I swore to protect humanity from all threats outside or inside. This may not be the same humanity which I made that swore but even I will still uphold it and that includes faunus. Cortana tell me everything I need to know about this planet."

A/N: Well this is the first chapter of my first story that I had ever made. I had seen many Halo/RWBY crossover ideas with a lot of potential that are abandoned or simple the writer simply rushes his or her idea and doesn't do an understandable work or they finish throwing to the side a lot of things that could improve their stories. I don't want to be of those writers so I will ask for a little bit of help from those people with more experience to improve this and future stories that I made.

One thing all should know is that I will not stay completely cannon to the RWBY story. Honestly I have seen stories were the plot is the same to that of the cannon story of RWBY only with some added to the mix but no big real difference. I will try to have a healthy combination between cannon and non-cannon and I will appreciate ideas from people that take a liking to the story. Also this chapter takes place 3 years before cannon RWBY starts.

Another thing is that Chief will be stronger than several of the first year students in Beacon academy to the point that he could take on an entire team of hunters but only by using 'Spartan Time' but the Chief is going to have some upgrades through the story that would allow him to fight against professional huntsman in equal ground.

Finally is that there will not be pairings with the Chief, at least not now maybe in the closer future but like I said not now.

Next chapter: The Chief is going to bust a meeting of the White Fang but leaving with no witnesses will not be as easy as he previously thought thanks to a certain bull faunus.