Disclaimer:

I do not own Halo or Mass Effect.

I am a big fan of both Halo and mass effect. I finished both Mass effects and halo1-2 in heroic. (Can't manage to play Halo3 and Reach for…..Hey, not everyone can afford an Xbox).I know there's a lot of H/ME crossovers out there already but hey, there is always room for another one right? This is my first attempt at a crossover so tell me what you guys think of it.

Please note:

This is AU so do not complain about the storyline being "Non-cannon" or something as like that.

In this AU the Asari didn't discover the Citadel in 1080 BCE instead they did ay 580. The Rachni War occurred in 501 CE instead of 1 CE. The Krogan rebellion began in 1200 CE rather than 700 CE. The actual names of the dates will remain the same though (580, 1, 700).Simply put, they will just occur 500 years after what the ME timeline actually says.

My English is HORRIBOL so please forgive my grammatical mistakes.

Act 1: Big bounty

January/11/2662

Milky Way/Minos Wasteland/ Caestus system

Near planet Temerarus

Onboard the Batarians slavers frigate Torment

Nola, the captain of the batarians frigate shakes his head with disbelief. He's been reading the content of his datapad five times now and he still can't believe the report it contains.

"So let me get these straight, he barked. We just found remains of a ships which is almost as big as a cruiser, which design doesn't match with any known races, don't run on element zero, and is nearly a hundred year old?"

"Precisely, Captain." Gadha, his first officer, replied.

"I don't get it'. Captain says in a confused face. 'The Caestus system is part of one of the most busy slave trade routes, why didn't somebody else picked up that ship on their scanners?"

"It's maybe because the fact that this ship was very well hidden behind the asteroid," Gadha replied. "We ourselves probably wouldn't find it unless we haven't used this asteroid to hide from that Turian patrol frigate."

"Okay, what do you think we should do with it? Blow it up?" Nola asks.

"Captain you are an idiot!" Gadha snapped. "Think about it, an unknown ship which doesn't run on eezo can't you imagine the possibilities? This ship may use a method of FTL travel which doesn't need element zero to function! "

"Did it occur in your fat head that ship may not have a FTL drive?" Nola replied in a tone that made Gadha's skin crawl. He knew that Nola didn't become captain of the Torment because of his capability; he became captain because he slaughtered every one of his competitors before assassinating the Torment's former captain.

"This system does not have any native intelligent race, Gadha replied with awe. And the ship is too small to be a sleeper sleep, so it must have a FTL drive."

Nola lets out an irritated growl. "Even if the ship dose has a FTL drive that does not use eezo, how the hell we're suppose to use it?" He asks with frustration.

"If we can't use it we sure can sell it." Gadha pointed out. "The Hegemony or any other council races will pay handsomely for a FTL drive that doesn't use eezo. Besides, he smirked; the ship is form an unknown race and nearly a hundred years old. Every part of that ship can be sold as a high-value piece of alien artifact. Captain, that ship IS a goldmine!"

True, Nloa thought. He doesn't count much on the Hegemony but any of the council races will easily pay millions for a FTL drive that doesn't run on eezo. And after the words about this ship will get into public any artifact collector will pay high price for any parts of that ship.

But there is a problem, he reminded himself. His ship is currently delivering a very important "cargo" which, if delivered within next five days will get them 70000 credits. Then again, he thought, this ship is a much bigger prize and also he remembered the "cargo" is a researcher who supposes to have a vast knowledge about alien technology.

"She may come in handy," he muttered. Then he spoke out loud. "Okay Gadha, you win. Board the ship and capture anything that looks valuable."

"At once, captain." Gadha replied and quickly went out to gather a team to board the unknown alien ship.

Nola watches as he left, a sinister smile started to cover his face. As soon we find the FTL drive Gadha, He thought himself; I am going to give you a present that involves one of the Torment's famed airlocks.

Act 2: Sweet dreams….No more

January/11/2662

Milky Way/Minos Wasteland/ Caestus system

Near planet Temerarus

Onboard the derelict ship.

"Chief? Can you hear me? "

John-117, better known as Master Chief slowly opens his eyes. He is in a cryo pod, he can hear it opening up but where is he? There is no light, no people just a small glowing human figure in a pedestal that look like…..

"Chief!"

Suddenly, everything about the past started to flow in his mind. He remembers the Human-Covenant war, The Battle of Erath, The battle of installation 00 and most importantly….he remembers …..

Cortana!

"Chief! I need you!"

Chief immediately jumps out of the pod and extract Cortana's data chip from the pedestal then insert it on his helmet.

"I'm here."

Cortana lets out a relieving sigh. "I thought I'd lost you."

"What's going on?" Chief asks in his normal business like manor.

"There's a ship nearby!" Cortana states in a near panic tone,

"Calm down. Is it Covenant?"

"I don't know."Cortana admits with a little bit of frustration. "The Dawns sensors are virtually toast. We were damm lucky that the proximity sensors…."

"Don't worry, whoever or whatever they are I'm sure we can handle them". Chief reached out to where he had secured his MA5C Assault Rifle.

"Um…chief?" Cortana interrupts.

"Yes?"

"You do know that we are in the vacuum of space and that thing needs air to fire, right?" Cortana asks.

"You know sometimes I hate it when you are right," Chief replied. "Okay, what's plan B?"

"There is an armory two room ahead of us; I think Arbiter was generous enough to left at least a couple of plasma rifles there." Cortana replied.

"Let's go." Chief said.

Act 3: The Forward Unto Dawn

January/11/2662

Milky Way/Minos Wasteland/ Caestus system

Near planet Temerarus

Onboard the Batarian boarding shuttle.

"Two hundred meters." The pilot reported as the shuttle slowly edged towards the derelict ship, two short burst from its forward thrusters slowing their approach until they were drifting forward at a little over walking pace. Gadha only nodded in acknowledgement before activating the powerful spot-light built into the nose of the shuttle, its bright beam casting long shadows as it passed along the battered hull.

"Wherever she's from, she took one hell of a beating," Boka, one of the slavers pointed at what had been agreed on as the "front" of the unknown ship," it's almost like someone cut it in two with a knife."

"No, not a knife," Gadha leaned forward, "see the edges? Scorch marks: something must have melted through the hull in an instant, like an industrial laser cutting sheet metal."

"Are you saying that something or someone cut this thing in half?" The pilot did his best to suppress the shiver running down his spine, "Gadha, is this ship really worth boarding….."

"Just do your job pilot!" Gadha Barked. The pilot quickly shook his head and re-focused his mind on the shuttle's control panel. The shuttle zoomed towards the derelict craft, landing in one of the many openings. The shuttle's doors opened and about one and a half dozen Batarian slavers popped out, floating at first, but then their magnetic boots kicked in, allowing them to walk across the floor as though there was gravity. They all had their assault rifles out, ready to fire. It was highly unlikely they would encounter any hostiles, but one could never be too careful.

"Clear." Boka said. With that, Gadha stepped out of the shuttle, wearing a MK-IV Partisan Armor, and armed with a MK-VII Terminator Assault Rifle and a Judgment MK-V pistol. HE took a look around and then put two fingers on the side of his helmet.

"Everyone listen up!" Gadha spoke up. "We're here to salvage anything from this ship that looks valuable; it's obvious that this ship was a warship so Team Alpha will look for the armory and any weapons we can use, Team Bravo will look for the engine room, I will lead team omega and look for the bridge and boka, you and the rest will guard the shuttle. Any question?" He asked.

There was a moment of silence.

"Alright, let's move."Gadha said. The slavers proceeded forward into the deep interior of the once proud Charon-class light frigate UNSC Forward Unto Dawn.

Little did they know about the fate awaits them.

Act 4: Arbiters generosity

January/11/2662

Milky Way/Minos Wasteland/ Caestus system

Near planet Temerarus

Onboard the UNSC Forward Unto Dawn.

"Well, I never thought he would be THIS generous!" Cortana commented with a wide grin in her face.

Chief had to agree with Cortana's comment; the armory was literally piled with covenant weapons, everything from Type-25 Directed Energy Pistol (Plasma Pistol) to Type-51 Carbine (Covenant Carbine) were floating in the armory.

"If I manage to get back to earth alive, I will get that guy a glass of…...whatever liquid Sangheili's drink.." Chief promised himself.

He quickly grabbed two bandoleers of Grenades, followed by a Type-51 Carbine (Covenant Carbine) and pairs of Type-25 Directed Energy Rifle (Plasma Rifle) and Type-33 Guided Munitions Launcher (Needler). Slipping a number of spare magazines for the Carbine and the Needlers into a rucksack, he lifted it onto his shoulders, careful to stop it dislodging his Carbine from its place behind his right shoulder. Securing the straps around his body, he attached a Needler to each thigh, below the Rifles. He then grabbed a Type-52 Directed Energy Support Weapon (Plasma Cannon) and made doubly sure that it was fully loaded before turning and heading for the exit.

"Attention intruders! Armageddon coming trough!" Cortana cheerfully declarers' as chief started to walk through the hallway using his magnetic boots.

Well there you go the first part. And before anyone asks I am going to clear two things

The reasons that chief survived so long in cryo will be explained in the following chapters so don't complain about that.

I know in the real Caestus system doesn't have an asteroid field but in these AU there is a rather large one near planet Temerarus.

And again please forgive my grammatical/spelling mistakes.

And finally,

Please R&R.