A/N: Hello guyz! This is my first fiction story involving a crossover between halo and mass effect. This story takes place just at the end of 'Halo:Escalation-The next 72 hours' and during Mass effect 2 that continues to Mass effect 3.

On the side note, Jorge-052 is alive and lives aboard the infinity crew after being rescued in an unknown space. Carter-A259 is also alive. That will be explained.

Disclaimer: I don't own Halo or Mass effect, for the former belong to bungie/343 and the later to bioware. The following story is purely mine. This is 100% AU based story line.

Chapter 1: Strange turn of events

Installation 03

July 26, 2557

"What just happened!? This monitor has nothing to do with the halo, yet it attacked me for building and bringing my army into this facility. Had it's governing protocol been changed? That explains it's behavior" thought the Didact, confused, after being shot by 859-Static cirillon (monitor of the composer's forge) at the back and teleported to installation 03's control center.

"So the builders restricted my access to 'their' installations, even after a long time" Didact said to himself gritting.

When the installation's monitor failed to respond after being queried about the service portal between the composer' forge and halo-03 which was activated , Static took temporary control over the halo and was annoyed at Didact for bringing the mechanical prometheans to the ring world. This is because, the ring worlds are forerunner builder constructs and prometheans are forbidden (promethean - builder rivalry).

Didact lost the index where he was shot and got teleported empty handed. The blue team got their eyes on the index which the forerunner dropped.

"Chief! Now what do we do?" asked kelly-087 after the blue team recovered from Didact's sweeping attack. Chief took a time to respond, his visor broken. he had to do something or it will be late to stop the rogue forerunner. But chief has the habit of improvising and adapting to situations so quickly. He then got an idea.

"We need a plan...static! Can you contact the halo's monitor?" asked chief with little hope.

"No reclaimer, The monitor Abject Testament failed to respond when I contacted him to query about a service portal" replied Static.
Chief frowned at the response. He needed the halo's monitor to work with the ring.

"*SIGH*...Now that complicates things" said Fred-104 nodding dismissively. The situation further caused dismay. When the team felt the hope was gone, something hit the Chief's mind.

"Static, What are your exact primary functions?" asked Chief.

"I am a promethean construct designed to be the over seer of the composer's forge at the place designated - 'Clinquant'"

"But you attacked the Didact, who's a promethean himself" said Linda.

"I did because I had to stop him from leading his prometheans to the installation which is beyond his jurisdiction. So I temporarily changed my operational parameters what would eventually fulfill the halo monitor's role" replied Static.

"Exactly! Can you override your protocols once more to take control of the halo?" asked Chief. Now his team members understood what their leader was getting to.

"And so that we can stop him from using the ring" said Kelly. The Static was silent for the moment analyzing the query and then spoke.

"Hm, If you give me access to the installation, I can instantly take control of it's entire security and service networks for the time being" replied the monitor. Chief then walked over the index and took it into his hands. This is the reply that master chief was waiting for. After getting what he needed,

"Get me to the control center so that I could end this" said the Chief. Suddenly, the mechanical promethean watchers and soldiers swarmed their location.

"Oh-oh! We got a whole army to fight" said Kelly.

"Dammit! Team, stay here and defend this region. Static and I will take care of the Didact" ordered Chief.

"Roger that Chief and good luck" replied Fred to which he received a green blink in his visor.

"Alright let's take care of these machines" said Fred and the three took covering positions and open fired at the prometheans.

Chief then turned to the monitor, "Let's go"

"Be ready for the jump" replied the monitor and immediately both were teleported out of the place.

In the control room, Didact was so furious that he's one step back from firing the ring and destroy humanity. When Chief and Static cirillon arrived, Didact saw them and the index in Chief's hand.

"Give me the Index human" said the Didact and then turned to the monitor, "You know where your duties lie!"

"I transferred my baseline priorities based on two crucial data I obtained recently. One being to act on behalf of Abject testament due to his absence and the other is to prevent you from bringing your abominations here which is beyond your jurisdiction" replied Static. Didact angrily grunted in response.

"Are you going to use that against me?" asked the Didact to Chief to which he didn't respond.

"Why do you want to use the most powerful weapon against a single being?" Didact asked chief, still confused with his ideals and his striving to defeat him even if he knew he can't.

Chief replied "You killed my friend, you killed millions of humans, you tried to kill me. I've tried to end you with blades, with guns, with explosives, by knocking you into slipspace and none of it worked. But, I bet this does" replied Chief, showing him the index and immediately he inserted it in the holo panel and used two holographic cylinder looking console nearby and turned both the cylinders clockwise and pulled those out slightly. This act shut down the halo's main weaponry and safety systems and directed the primary control nodes belonging to halo's actual monitor to Static.

"The ring is your's now. Do what you have to" said chief to the monitor.

"Of course reclaimer. I now possess interim control over this installation" Static replied cheerfully.

Then it used the control panel to remove he control room segment of the halo ring and made it to free fall directly into the composer's forge.

Didact angrily growled "What have you done human?"

Chief was immediately teleported to another safety region of the ring witnessing the Didact along with a part of halo crashing over the composer's forge. The Didact was immediately hit by multiple composer beams that did something to him, but he vanished none the less.

Then Static transported the Chief to his team who had finished killing the last of the mechanical soldiers.

"Chief, What just happened? This ring feels odd" asked Kelly.

"We saw a part of ring ejected out and suddenly it was like gravity's gone" said Linda.

"Didact can now rest in hell" said the Chief, relaxed.

"Huh, So he a goner? Fine, mission accomplished" replied Fred. But chief said not to be too sure as he knew that he's only been contained knowing the true nature of the composer. But everyone's relieved that the devil that were haunting them had been exorcised. They all turned to face the monitor.

"Thank you reclaimer. With the didact gone, I can carry out my work here peacefully, for I have a new purpose from now on. I will transport this installation to the safety for refit and repair, for you are free to leave the installation anytime" said the monitor to the blue team with enthusiasm.

Chief nodded and turned to face his team, but suddenly a cold chill and darkness filled his mind. His vision to distort. Chief started to lose balance over his body and grunted pressing his helmet with his palms and knelt down. His friends started to worry about him.

"Chief! what is it? What happened?" asked Fred, after seeing him acting weird. Monitor's eye was stoically fixed at the Chief.

There was a sharp cry and a growling scream, both of which he recognized. Then a blurred figure appeared, saying his name in a long echoed voice.

"Get here!...Time is SHHHOORRRTTT..." said the ever familiar voice then series of architectures, tall structures and a strange mysterious tower like structure which was emitting a sharp laser beam like light to the top of the atmosphere into the vanishing point appeared which he didn't recognize. But then appeared a silhouette of a woman John would never forget. It was Cortana. John couldn't believe what he saw. Then the silhouette turned into a glyph, A forerunner symbol he didn't understand. Then this all stopped.

Chief's senses came back to normal and noticed Kelly placing her hand on his right shoulder. He then stood slowly and turned to look at everyone. Even though he couldn't see their faces, they were worried.

"Chief, what happened?" asked Linda. "Reclaimer, what was that? I recorded an unusual neural activity in your brain" said Static.

"I saw or I think I saw...Cortana" said Chief which alarmed the three. But even Chief couldn't believe it.

"What?" shocked linda-058.

"But Chief, she is gone already. You saw what happened to her. She died saving you from Didact above Earth" said Fred-104, soaking himself in dilemma.

"Not just yet. I saw this too" said Chief as he knelt down and used his index finger to draw the forerunner glyph in the sand. The three didn't recognize what it was.

"What is that? A forerunner glyph" asked kelly-087 in confusion. Static immediately recognized the glyph.

"THIS...can't be!" exclaimed Static Cirillon, but in a low voice but enough to get the blue team's attention.

"You know what it is?" asked Linda-058 to the monitor.

"This glyph represents a shield installation" explained 859 Static cirillon, his voice expressing disbelief and dilemma.

"A shield world? Like Requiem?" asked Fred-104.

"Yes. This glyph represents the installation -'Iridescent' "

"Do you know how were I able to see see it? I also saw many architectures, forerunner structures, More like a city" Said chief.

"It must be Iridescent. Someone had used a long range directed neural beacon, a technology similar to the composer" explained Static.

"I am wondering who sent the beacon about the installation which was a highly guarded secret even among some of our creators" said the static with surprise and confusion.

"What is this installation, exactly?" asked Chief still with some headache.

"Iridescent is a construct made by our creators for Research and Development, any thing that gives the forerunners an edge to whatever they are up to. That is why it was a closely guarded secret for 150,000 years prior to their encounter with the flood parasite. No one but only select few forerunner builders and warriors including Didact and the constructs like me are aware of its exact location"

"Why would someone hide a planet? I mean, We found the Requiem, Onyx, but why hide this?" asked kelly-087.

"Like I said, Iridescent is a unique construct with full of Research and development facilities. Combat skins, weapons, starships, AI constructs, the list goes on. When the flood proved effective in turning our own tactics against us, my creators predicted that if the facility gets into flood's hands, then nothing could stop them. The composer and his massive ship Mantle's approach were seeded out from that very facility" explained the Static.

"But that doesn't explain why I got these visions" said Chief.

"It's a cryptic message, Reclaimer. Our creators used this method to transmit and receive encrypted short messages. Warrior servants use this in their combat skins to communicate with their fellow soldiers even at astronomical distances. You humans are new to this, maybe that's why you didn't understand. My creators could easily understand this. This served well at times of war and other conflicts. It is immune to interception" said the monitor to the chief.

"That's crazy as it sounds, but what does it mean now?" asked Fred.

"Clearly it's a message to you. You have been called, may be the monitor of that facility that I'm not sure" replied Static.

"What do you suggest?" asked the Chief.

"If its not trouble to you, then I suggest you investigating this. Besides, that facility is intended for you reclaimers, as decided by my creators" said Static.

"Could it be Cortana like you said? Did she send the beacon?" asked Kelly.

"We don't know for sure. But this is something I'm not willing to slip out. It's worth checking it out" said Chief.

There was a moment of enthusiasm among the blue team. If humanity could study the technologies in that facility, then the could once again regain their glory. But that thought was immediately shelved. They first need to check on facility and see who was it that actually called them.

"Before that, I need to ask you something. Is that place safe, I mean we don't need any surprises" asked Linda.

"Absolutely. While I'm not sure, who triggered the beacon, I can say that it's definitely not your enemies or any other people. Like I said, It's heavily guarded and no one can find it" said the static to the team.

"In that case, we are ready to go. How are we suppose to get there?" asked Kelly.

"There is a special slipspace teleportation system in every forerunner construct. It is used at times of extreme emergency. This helps in travel only between forerunner constructs instantaneously" explained the monitor.

"Where is it?" asked the Chief.

"It is in an underground chamber with in this installation. Let me teleport you all there" said the monitor and teleported them to the chamber.

The blue team and the monitor reached a large dark room beneath the ring's surface. The room was quite similar to the installation-04's control room, but a smaller version of it. Only a pathway of some 5meters wide where they are standing was barely visible with a series of floor marker lights on both sides along the pathway. The pathway looks like it's just suspending in air using artificial gravity or with one end hinged to a wall. But that's not visible.

"Come" said the monitor and the blue team followed it in the lightened pathway.

"Well, anyone's got any idea of what and when to tell the HIGHCOM if they decide we went missing?" asked Fred to which others turned their face towards him while walking.

"Well, after we complete this new found mission. This could be a bonus for them" said Chief to which Fred chuckled.

Finally they reached the end of the pathway where they saw a large circle shaped gateway attached to the floor.

"This is it reclaimer. Now I'll open the portal" the monitor said and used a console nearby entering the coordinates for Iridescent. Suddenly a large portal appeared in the circular gateway. The blue team looked at it with no idea of what to do next but feeling like they had to move on.

"My job here is done. I hope you all will find what you seek. I must leave now to repair the ring world" said Static.

"And thank you for helping on our mission" replied Chief. The monitor then left the place by teleporting out.

The blue team slowly walked towards the portal. Then everyone vanished and the portal closed behind them. Masterchief and his teammates thus embarks on a strange new journey.

UNSC Security Council

HIGHCOM facility Bravo-6

Fleet Admiral Lord Terrence hood was waiting for a long time to get a word from blue team regarding their mission. It was in fact a personal favor for lord hood which Masterchief accepted to investigate. But now he's started to worry as the mission has taken too long. Hood immediately contacted the NAVCOM.

"NAVCOM, This is fleet admiral Hood. Did you manage to intercept any radio transmission from the blue team?"

"Negative sir! Last transmission ended 2 days before" replied the NAVCOM.

"Acknowledged, Hood out" replied Hood and cut the channel.

"Dammit! what happened to them!?" thought the admiral who was tensed.

Note: I'm a great fan of both halo and mass effect. But I don't exactly recall the in game dialogues spoken. So I've managed to stay true to the story line with some alterations in the spoken words. please don't mistake me if it offended anyone.

Don't forget to review.