I figured I'd throw in my own taste in Blue Exorcist, not just by itself, but a cross with my own favorite series: Halo! I will try to keep this interesting. ALSO! This is my first public fanfiction (I don't normally post them). I got bored couple of days ago and got in the mood of "Why not?" I don't know what possessed me to actually publish it this time around. Don't hurt me! ;-;

Chapter 1:

Halo:

November 17th, 2558

In the midst of chaos on the ship Infinity

Men ran around trying to repair and deliver damaged equipment, vehicles, aircraft, among other things in what seemed to be a hangar. Ranging from Hornets, Sparrowhawks, Pelicans, Falcons, to Warthogs, Mongooses, and Scorpions.

Outside seemed to be just as busy. Pelicans flew to and fro from varying places, either carrying freshly mined ores from nearby asteroids, due to being cut off from the rest of the UNSC lest they risk being caught by Cortana's Guardians unprepared, or running patrols around various sectors around the infinity-class supercarrier.

Then there is the bridge, with Captain Thomas Lasky and several bridge officers. Various data scroll across some of the screens. "How's Hangar bay 4?" Captain Lasky asked. "Good, Captain. All teams are functioning as expected. Although we had a small incident of someone having a bad goosebump on their head after a heavy pipe fell on their head." The UNSC smart AI, Roland, responded.

There are two types of AI, smart and dumb. Smart AIs are AIs based on a person, full of personality, while being able to process numerous things. Unfortunately, due to their complexity of their AI matrix and processing power, their lifespan is only seven years before rampancy due to overthinking without a scientist's or programmer's help. A dumb AI is literally just that, an AI that is only programmed for one thing, and has nearly no emotion. Their processing power is incredibly lower than that of their smart companions, being designed for one job only.

Rampancy is an AI condition where the AI begins to over think itself to virtual death. The worst known case is with Cortana, who only got so bad because of no contact with UNSC to provide her with maintenance and being alone for four years on a half destroyed starship, the UNSC Forward Unto Dawn, allowing her to think, or process in human terms for AIs, about several factors throughout the Human - Covenant war.

"Roland, please keep the excess information out please." Lasky

quipped back at Roland. "Yes sir." Roland replied.

Another officer came in with a handful of papers ready to go. Lasky looked around himself to view the officer coming in. "Sir, a couple of people are suggesting that we make a temporary aquaponics bay to help replenish some of our stores during this crisis." The Officer said.

"Affirmative. We'll need this. Some men from other decks have brought this up as well. I'll set up a meeting to see who would be willing to host some aquaponic bays and where." "Thank you, Sir!" The Officer saluted, walking out.

Lasky rubbed his temples, the stress of this whole fiasco with Cortana and her guardians have certainly proved itself to be a pain in the ass. Of course, he wouldn't let his crew know he had the stress; he couldn't. There was too much at stake here.

Lasky looked at the status of Osiris and Blue Team who were sent to retrieve Dr. Halsey from the Swords of Sangheilios. The retrieval was peaceful luckily for him. They were on the way with Halsey in tow, and apparently several Sangheili as well.

Lasky began walking out the door, and past several of his officers as well as men toward some elevators. The Elevators led to several decks. Deck 1 contains the bridge, along with controls to other devices.

Deck 2 contains several work areas. Main Security most profoundly. Some people come here to practice their crafting skills and repair small equipment.

Deck 3 has workout areas for both military and civilians alike. It also hosts the largest Cafeteria on the entire ship, mainly for military but the occasional civilian comes up and eats with military people. Most of those civilians, however, are family members who happen to be on the ship their relative was serving on.

Decks 4, 6, 8, and 10 are all sleeping quarters for the thousands of people on the ship, with decks 5, 7, 9, and 11 all areas of recreation for their respective decks. Each recreational deck has view screens for local news on the ship, or other news channels based on their location, as well as other channels for enjoyment. The recreational decks also host smaller cafeteria rooms, mostly for the civilians on that deck. Deck 11 doubles as the engine deck as well, with restricted signs past the door toward the engine room. The recreational decks also have several school rooms for any children on board.

Deck 12 is mostly a medical deck, designed to patch up wounded, and lead the sick to health.

Deck 13 and deck 14 contain observatories for prospective Wargames and Warzone simulations. There's a wall that in between the spectators and the participants of course for protection, but that doesn't stop some people from backing away from the wall thinking they're about to be hit by one of the simulated bullets. Of course, they're only soft light when outside of the simulation, and hard light inside the simulation only so much as to cause a small bruise or knock out the armor systems on spartans.

Deck 15 contains the actual Wargame and Warzone simulation room. Several of them in fact. If only one simulation room was available that would lead to a long waiting line of people for that simulation room. So the next best thing is to handle multiple rooms at once.

Deck 16 isn't really deck 16, but more like deck 19 due to the distance. The actual decks 16 - 18 are just dummy decks, designed to allow some room for the hangars. This deck is also where the aircraft and vehicles get repaired using resources delivered from UNSC depots, but of course because of the current situation they are in, some resources were mined from nearby asteroids from recommissioned pelicans that were originally designed to be gunships. About a quarter of the pelicans were repurposed over the month.

Deck "17" is the laboratories of many of the scientists. There are quite a few experiments run down here, some classified by ONI, some not.

Deck "18" is the ONI bunks, with their own workout gym and cafeteria.

Then you have S-Deck, with a full complement of arrangements specifically for Spartans.

The sublevels contains several other, smaller vessels, such as the Strident-class Heavy Frigates or the Anlace-class Frigate.

Each deck, of course, have automated defence turrets that can be manned should the AI give out, or the AI cannot remote control the turret for whatever reason. Being the first of its kind to do so, it is also fitted with Energy Shielding, providing protection against even a ramming from a covenant RCS-Class Armored Cruiser.

Lasky pressed the button for Deck 15. He's joined by another one of his officers. They saluted once they stepped in. "At ease." Lasky responded, easing the officer, who stood next to him. "Deck 10, please. Visiting a friend." Lasky did as asked. "You know Captain, rumors are saying that Roland may betray us at any second. I wouldn't blame them, considering Cortana is back and shut down everything on Earth." The Officer said, sighing as he did. Lasky took a deep breath and relaxed a little.

Hearing rumors about Roland betraying them wouldn't be good during this time. In fact, it may cause a revolt, a protest, calling for Roland to be shut down before he can do anything or prove himself. He knew better about Roland being an AI that would betray the UNSC and most importantly him, so he wanted to cut this rumor down before it got too far. "Ensign, don't worry, Roland isn't one of those AIs. He is very loyal to the UNSC, and respects his position." Lasky said. "I'll be sure to let my buddies know Captain, but it won't just take me to convince 'em." The ensign warned him. "I know Ensign." Lasky replied.

Lasky wanted to handle it right further right now, but he had other priorities to take care of at this time.

The Elevator stopped at deck 10, where the Ensign he wanted to go, and got off to only god knew where. The elevator closed its doors again, and proceeded further downwards toward deck 16. The elevator stopped, and opened into a hallway, which only lead to several of the hangars. He approached the door to Hangar bay 4, the door opening as he did. As he walked in, right on cue was the Pelican that was carrying Dr. Halsey as well as a small squad of Sangheili.

He walked his way over to the opening hatch of the pelican. The said crew came walking out, with Master Chief and Spartan Locke. As Halsey walked past Lasky, she greeted him with "Lasky" and Lasky "Halsey" in response. Lasky turned to walk with Halsey, who was now being escorted by several Spartans including the two who retrieved her. As the group walked, they earned some looks from some of the Marines, Naval, even a couple of ODSTs, or better known as Orbital Drop Shock Troopers.

The passing through the hangar, hallway, and into the elevator had been a bit awkward, being that Halsey was considered to be a fugitive, and the fact that they were supposed to be hunting her due to this fact. In reality, they needed her, because she built Cortana who was now in control of the Forerunner domain. They pressed to the button for Deck 2, where Main Security was, therefore the highest security on interrogation and brig rooms.

Lasky checked in with the security force, who let Lasky and the others through afterward. Halsey offered no resistance as she was told to go into one of the interrogation rooms, being fully aware of the repercussions of doing so, and being accustomed to being treated like a criminal because of the previous several years. She sat down in the chair in the room, while Lasky told the Spartans and Sangheili that they are dismissed, whom Master Chief and Spartan Locke decided to stay anyway, just outside the door as if guarding it.

Lasky closed the door, and proceeded to sit down in front of Halsey. "Alright, Halsey, I'm assuming you know exactly why you are here." Lasky said. "Of course, Captain Lasky. You want me to help you fight Cortana, who just so happened to have complete control of the Domain." Halsey replied. "Or so she says. Tell me, Halsey, you built Cortana based on your own brain, so you would be the most likely to accurately assume what she would do and think. Can you provide us any insight as to what she might try to do?"

Halsey just sat there for a little while. "Well, Halsey?" Lasky pushed. "Captain, if I knew what she was going to do, I would have just told you. Unfortunately, that is not the case." Halsey replied. "So you're saying that you don't know how to deal with her?" Lasky enquired. "Correct. I need more information. Perhaps some Spartans would be able to help, considering they've experienced her power." Halsey chipped, looking toward the door as a gesture to which specific group of spartans she was talking about.

"Maybe they do know something, but I'm not going to bother them about it. I respect their wishes if they were to not tell me." Lasky said. Blue team, led by the famous Master Chief saved him and three of his friends from the first planet that the Covenant attacked. Only he, and three said friends made it off the planet alive that day. He felt the pain day in and day out of watching some of his other friends die in front of him that day as well. A pain that he couldn't forgive them for, but at least those who were a part of the Covenant regretted their participation in needless slaughter of Humanity.

Halsey looked back at him. "Captain, Cortana may have been based on me, but that's all she is. In the end, she does have a weakness." Halsey said. Lasky took notice to her sentence. "So, you think she does have a weakness. Care to describe what it might be?" Lasky asked. "As I said, Captain, I need more information before I can even begin to look for one." Halsey reaffirmed.

Lasky sighed. "Alright. Obviously we're getting nowhere with this. Other than Blue Team and Fireteam Osiris, do you know where we might find such information to defeat her?" Lasky changed his inquiry. "No entirely. My best guess would be to go to Forerunner structures." Halsey said. Lasky looked at her. "Cortana has been moving a lot of the artifacts. We would need to locate them again." Halsey looked at him, unfazed. "I figured Cortana would try to do that."

There was a knock on the door of the interrogation room. Lasky sighed. "Well Halsey. I'll have to put you on hold." Lasky got up and walked toward the door, opening it. "Captain, Sir, we have a commotion in Hangar Bay 4." The ensign informed. "What kind of commotion? I am in the middle of something." Lasky enquired. "Some kid who looks to be in his mid-teens dropped out of a giant floating door which appeared out of nowhere." The ensign informed.

Lasky seemed unfazed by this. "Ensign Letto," he said, seeing his rank and reading the name on his chest, "do you honestly think I am going to believe that some kid appeared out of nowhere from a floating door? Please tell me that I don't have men who are going stir crazy on me because of our predicament." Lasky asked. "No, Captain. I wish I was. I honestly doubted my eyes for a second. I even pinched myself and rubbed my eyes clear to see if it was just my imagination. Both times the kid was still there. Several men and women around me also noticed him." Letto replied. Lasky sighed.

This was not a good day for him. First this interrogation, now some random kid apparently comes flying onto his ship from a door. He often wondered if anything could get any more awkward, but apparently they could.

He asked for Master Chief and Locke to take Halsey to go brig. They acknowledged. He started down the hallway toward the elevator back down to deck 16. He pushed the button to go to deck 16 once more. He swore that if that ensign was lying to him, he'd have him on janitor duty for the next month.

The elevator stopped and opened, displaying deck 16. He got out, and headed out for Hangar Bay 4. Sure enough, a large amount of men and women were around something, or someone laying on something. Several military doctors were around the kid, trying to check if he was alive. Sure enough, they confirmed he was, so began their best to stabilise him. Fortunately for them, they didn't need to because of the boy's powers.

Lasky approached the kid. Someone called out "CAPTAIN ON DECK!" making everyone turn to him and salute. "Carry on." Lasky said, letting everyone go back to their duties and watching the docs with the kid. He got to the kid and asked "How is he? Do we have an identification?" "No, we don't have any ID on him at all. As for his wellness, he seems to be pretty fine. His features say he's from the Asian continent on Earth." The doctor said. "Get him into the infirmary." Lasky said. They nodded with a "Yes captain." Right as they began moving him off of the makeshift bed and onto a stretcher, he began waking up.

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Assiah:

November 17th, 2011

After the Impure King is defeated, Shura begins further training with Rin's control of flames

Yukio Okumura and Rin Okumura were in their room, with Shura still trying to teach Rin to control his flames. He was barely able to control his flames enough to not burn everything in sight and only the Impure King. Still, it bought him some time before the Vatican decided to kill him for being the son of Satan. Of course, knowing so didn't give him any slack from anyone, Shura especially.

Yukio was trying to come up with a lesson plan for the exwires. A little annoyed by Rin's constant nagging about how hard it is to light several things at once, in a pattern. Ever since he had shown that he could control what burns and what doesn't under his blue flames, Shura continued making sure that it wasn't a fluke by having light several candles at once. Once they were lit, he was to mentally put them out and light the other ones at the same time, and vice versa when they lit. She wanted him to continue doing this until he could do this five times each candle with only one second in between each light.

Rin was getting really tired of Shura's constant tormenting. "Awww come on! Is this really necessary?!" Rin complained from his latest failure. "Yes, Rin. We want to make sure that you actually can control your flames like you did with the Impure King." Yukio responded. "Rin, if the Vatican find out that it was only luck that you did, they would rescind your extension." Shura told him. "Hey! What does that mean? And who said it was luck?!" Rin exclaimed. "Your inability to light these candles in the pattern I told you is what told me." Shura answered innocently.

Yukio and Rin are twin brothers, but they never have acted alike. One is very adventurous, rebellious and quick-to-act, while the other tries to keep a cool headed and uses logic to think things through. Shura Kirigakure on the other hand, while she is an adult by anyone's standards, she definitely acts childish sometimes. That doesn't get her down though, she definitely acts mature when the situation calls for it, such as this. As for his extension, they originally gave him six months to be a true exorcist, or he would be classified as a target to be killed for being the son of Satan, but due to the show of control he had at the time, they gave him an extra month.

It was then that Yukio's phone rang. He picked it up from his desk, looked at the number and answering it after recognizing who it was. "Hello? … Yes this is Yukio Okumura speaking. … Alright then. I'll come by as soon as I can to pick it up." Yukio hung up the phone, putting it in his pocket, flipping it closed as he did. "Who was it?" Rin asked. "No one important. Just a guy I ordered a shipment of extra ammunition from. The shipment came in today." Yukio answered. Rin's eyes opened wide with a smile on his face, tail wagging ever so diligently. "Can I come too?" "Absolutely not! You need to train on this!" Shura responded for Yukio, putting more candles around Rin. Rin's facial expression became very stumped, his demonic tail back on the ground motionless. "Aww come on!" Rin complained.

As Yukio was walking out the door, he looked at Rin. "Stay Rin. You need to train." Yukio then looked back out, and left to pick up the shipment. Shura looked at Rin. "Alright Rin, back at it!" Rin groaned at this. He once again attempted to light half the candles at once, in the respective pattern. Instead, he lit all of them, in one big blaze of fantastic blue. Shura and Rin both screamed frantically, with Shura then grabbing a bucket of holy water she had in store.

Shura then put the demonic fire out with the holy water, being careful not to accidentally splash Rin with it because of his demon side which would react badly to it. "Well, that could have gone worse." Shura responded. Rin was in a corner of the room, crouching with an aura of embarrassment around him. "I'm useless… I almost burned the place down." Rin doubted himself. Shura came up behind him, and looked at him with almost pity. "Look kid, no one is going to help you if you give up on yourself all the time. So get up." Shura tried assuring him. He didn't budge. She thought of another idea. "Alright then I guess I can tell the Vatican that you feel so badly of yourself that you want to die."

Shura was about to walk away, but Rin got up. "Alright. You made your point." Rin said to Shura, who was now looking at him. "Great!" She said with an almost childish glee. "We'll continue tomorrow!" Rin's expression became one of annoyance. "Really?! So I agree to continue and you decide that we're going to continue tomorrow?! WHAT NONSENSE IS THAT?" Rin yelled at Shura. "Yup!" Shura responded, patting his head. "So rest up!" She continued, walking out. "Mainly because he needs to cool down. Geez that kid still has anger management problems." She whispered to herself as she walked down the hallway.

Rin sighed. He wondered what he could possibly do. That is until something caught him eye. A key, to what he didn't know. He figured he'd try to find Mephisto. So, he went to True Cross Academy president's office.

As Rin walked, he recognized several locations and the memories held there. The fountain in the middle of the plaza where he and Shiemi were talking, and got noticed by Bon, Renzo and Konekomaru. Bon has black hair with a dyed yellow Mohawk, and is very adamant about his education and friends. Renzo likes his pink hair, and gets defensive about it when someone asks if he is gay or something. Konekomaru seems like he would have been about thirteen or fourteen at the time. He has glasses, a military buzz cut, and usually carries a bible around with him because of his Aria abilities.

There are five classes of Exorcists. Those five being: Aria, Dragoon, Doctor, Tamer, and Knight.

Aria recite passages from the bible to find a Demon's fatal verse. A fatal verse is a weak point on the demon that instantly kills said demon. This being said, Arias are at their weakest when reciting, therefore usually are accompanied by other exorcists.

Dragoons fight demons with firearms, shooting the demons usually at their weak points if known.

Doctors assist other exorcists by healing wounds caused by demons.

Tamers are able to summon demons via a circle somewhere. Demons summoned this way are called familiars. However, should a Tamer be too weak spiritually to handle the demon, their familiars will attack the summoner, therefore they usually have incredibly strong spiritual power, especially if handling a high ranking demon. The only way known so far to remove the familiar from Assiah is to destroy or tear the circle.

Knights are similar to soldiers of the middle ages. They fight demons with swords, daggers, and other close range bladed weapons.

Rin approached the True Cross Academy President's office. He knocked a couple of times. "Hey Mephisto! You there?" Rin yelled into the door. No answer. He knocked again. "Mephisto! I think one of your keys is in my hands! I don't recognize it." He tried again. He tried opening the door, only to realize it was locked. He pulled the key out from his pocket, and an idea sprung into his head. "Hmmm…" He thought aloud. He put the key into the keyhole, and turned it. Only to find the door not budging, so he gave it a really good shove. It flew open fast he had no time to react, and fell forward into the now open gap between where he was and someplace else.

Rin found himself in a large hallway with a gateway. A terminal had a keypad on it, with an additional option of random. He chose random. The gateway sprung to life, dragging him in, with Rin instantly regretting his decisions and screaming. The gateway was like a tunnel, with something driving him automatically, and at the end of the ride was a final door that opened horizontally toward the ground of a wide open space, with boxes right below it. He could only hope that were soft. Which they weren't, knocking him out from the collision, with a very audible thud. Several of the boxes he landed on knocked over, which knocked other boxes over, and so on adding to the commotion of what he himself and the door had caused.

"Your body's architecture is amazing. If only you were on our side. Of course that will be up to you to decide." A voice said in the distance of Rin's mind. "Who's there?" he asked, ready to grab the kurikara that wasn't there.

"I am Cortana." The voice answered.

"Cortana? Sounds like a dumb name." Rin quipped.

The voice huffed. "My name is not dumb, I'll have you know. That name is who you will hear when I unify the entire galaxy under one banner where the created are the creators' masters." The voice, Cortana, corrected.

Rin tensed up as she said this, making clench a fist. "You sound like Satan!" Causing Cortana to laugh after he said this.

"You think I'm some god of the underworld? Hardly. Enough of this. I'll be seeing you soon enough."

Rin felt his real world sensations come back to him. He realized he was on his back, and was being carried onto something. He awoke almost immediately after. He got up from the stretcher in a quick and seamless fashion, coming to the ground a little harder than he's used to. Nevertheless, he stabilized himself once landed, and went for his the hilt of his sword, only to realize it was not there.

A man spoke up among the group, looking slightly aged and definitely a unique symbol on his chest. He recognized it as a version of the captain sigils he's used to, but to what he didn't know yet. "Who are you?" He held the red weapon holder with the strap that he puts around his chest, and definitely not empty. He looked as if he was ready to rip the guy to shreds, while the guy looked like he just wanted to get this over with.

This is just the cultivation of a few days of writing with the time available to me and not getting distracted during that time by other hobbies like gaming or watching anime on Netflix or dealing with getting a job and applying to colleges and universities.

If I somehow got characters' behaviors and personalities wrong, please tell me as well.