Halo and Mass Effect Crossovers
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Mass Effect - Orion (Discontinued) by Fallen2Pancake reviews
This is a Mass Effect - Halo - XCOM Crossover. In the year 2084 during the Asteroid Belt Offensive XCOM Elite Unit Strike-1 discovers an Ethereal Station but must Psionic Teleport away but something goes wrong. In the Year 2552 the UNSC Fearless an Orion-Class Assault Carrier is forced to escape Reach under heavy fire, during the Slipsapce Transit something goes wrong.
Rated: M - English - Sci-Fi - Chapters: 8 - Words: 61,867 - Reviews: 69 - Favs: 177 - Follows: 253 - Updated: 5/13/2022 - Published: 4/16/2022 - SPARTAN-B312/Noble Six, Rookie, D. Anderson, Shepard
War and peace by Curiously intrigued reviews
The reapers brings new galactic superpowers into the war after invading the Orion arm of the galaxy. will the conflict unite them against a common foe or will they open conflict with each other.
Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 2,510 - Reviews: 12 - Favs: 51 - Follows: 93 - Updated: 5/11/2022 - Published: 5/5/2022
Mass Effect: ODST Lost by Stardew's Stardrop reviews
ODST Captain Nathanial Renkov unintentionally becomes the first Helljumper to survive being dropped through a Slipspace anomaly. The problem? He has no idea where is and is surrounded by aliens the UNSC has no record of. Even worse? No one knows what the UNSC is. Follow his story as he tries to make sense of his new surroundings while trying to survive a new galactic threat.
Rated: M - English - Sci-Fi/Adventure - Chapters: 4 - Words: 15,072 - Reviews: 20 - Favs: 103 - Follows: 154 - Updated: 5/11/2022 - Published: 4/24/2022 - OC, Ashley W., Tali'Zorah, Shepard
The Way the World Ends by Canelo312 reviews
AU. Spartans never die. But we all know that's not true. A terrifying new enemy approaches and only time will tell if the forces that be can stop them.
Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 25,002 - Reviews: 8 - Favs: 61 - Follows: 85 - Published: 5/7/2022 - Master Chief/John-117, SPARTAN-B312/Noble Six, Liara T'Soni, Shepard
The Canadian Commonwealth by Vassago1991 reviews
In the vast multiverse events can happen that should never happen this is the story of one such event in a a universe that was should never have been.
Rated: M - English - Chapters: 3 - Words: 17,333 - Reviews: 15 - Favs: 54 - Follows: 56 - Updated: 4/26/2022 - Published: 2/24/2022
The voyage of Valiant by Lighting wolf knight reviews
There was more on the line... Yet plans and webs were made. Rated T for violence, death, and profanity.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 811 - Reviews: 1 - Favs: 5 - Follows: 9 - Published: 4/20/2022 - Miranda K., D. Whitcomb, OC, Shepard
Noble Effect by LoneSpartan52 reviews
Noble Six was alone after the death of Emile. The Pillar of Autumn had left Reach, leaving the lone Spartan behind. But what if instead of dying on Reach, fighting to his last breath, Six survived? What if he escaped Reach and headed for Earth, only to end up in another galaxy, in another war? Will he agree to fight the reapers alongside aliens? Find out in Noble Effect
Rated: T - English - Sci-Fi - Chapters: 16 - Words: 62,375 - Reviews: 130 - Favs: 391 - Follows: 529 - Updated: 4/19/2022 - Published: 7/3/2020 - SPARTAN-B312/Noble Six, Garrus V., Shepard, Javik
Reckoning of the Reclaimers (v2) by metts101 reviews
After the Great War Humanity was a different creature. Their brush with extinction left them cold and vengeful, and so they sought revenge for the transgressions of the Covenant species. With their eradication Humanity, driven by xenophobia, took their position as the unrivalled power in the galaxy. However, will a xenophilic alien federation, in a new galaxy, change their outlook?
Rated: T - English - Sci-Fi - Chapters: 2 - Words: 14,933 - Reviews: 47 - Favs: 279 - Follows: 393 - Updated: 4/1/2022 - Published: 9/24/2021
To Be the Last by Bruanshan Never-Seen reviews
A Halo/Mass Effect crossover, though not a typical one. This is the story of the last Forerunner, sent to a different galaxy entirely. How will he handle himself in this new glaxy where everything is different. Adopted from drich147. I corrected a mistake in chapter 3 regarding how long he has been there. I do not own Mass Effect or Halo.
Rated: M - English - Adventure - Chapters: 3 - Words: 13,070 - Reviews: 235 - Favs: 450 - Follows: 522 - Updated: 1/13/2022 - Published: 7/28/2012 - Didact
An Old Machine's New Home by Edgeoftoday reviews
A Reaper is launched from it's home galaxy during one of their many cycles, and spends countless years floating through the empty void of space. It's unintended destination results in the nearly destroyed machine unknowingly put in the middle of a galactic war between a coalition of religeous zealots and an ambitious race expanding over the stars. Picks up at the start of Halo: CE.
Rated: T - English - Sci-Fi/Adventure - Chapters: 6 - Words: 29,509 - Reviews: 77 - Favs: 274 - Follows: 371 - Updated: 12/25/2021 - Published: 8/22/2020 - Master Chief/John-117, Arbiter, J. Keyes, Cortana
Just Built Different by Pokeya reviews
Max Barrett, the child prodigy, is the single smartest man that humanity has ever or will ever produce. Regarded as both the greatest mind and as a naturally born supersoldier Max is guaranteed a life of luxury. Unfortunately, a single good deed has landed him in an unusual situation: he finds himself in a Halo/Mass Effect crossover universe.
Rated: M - English - Humor/Sci-Fi - Chapters: 6 - Words: 43,727 - Reviews: 67 - Favs: 201 - Follows: 241 - Updated: 12/24/2021 - Published: 12/21/2020
A Halo Effect Challenge by FallenDispair reviews
For a writer looking for a Halo/Mass Effect crossover idea. Free range use of what's inside. Details and new combined timeline of the two universes.
Rated: T - English - Chapters: 1 - Words: 11,833 - Reviews: 5 - Favs: 23 - Follows: 18 - Published: 12/20/2021
Inheritor Effect by Panther-Girl0251 reviews
The family and friends would have been know that Raine would be dead or she could be alive somewhere in the galaxy. They may have hope that Raine will eventually come back home to her family and friends. Wherever she is... or whenever she is found. Things are going to be different in the future she might discover something new... in century later.
Rated: M - English - Sci-Fi - Chapters: 3 - Words: 5,313 - Reviews: 5 - Favs: 9 - Follows: 15 - Published: 12/16/2021 - [Shepard, Garrus V.] [SPARTAN-B312/Noble Six, OC]
What It Means To Be Alive by FreedomOfThinking reviews
He's the last of his kind, and he's way out of his time. Waking up to a universe under the control of a despotic Artificial Intelligence was the last thing he expected. But the good news for him is that our favorite red-haired commander is all-inclusive and totally supportive of anyone, human or alien. Even if he's kinda responsible for the whole Reaper thing... whoops.
Rated: T - English - Humor/Adventure - Chapters: 5 - Words: 40,276 - Reviews: 50 - Favs: 257 - Follows: 348 - Updated: 12/16/2021 - Published: 4/10/2019 - Librarian, Didact, OC, Shepard
Mass Effect: Trailblazer by TallYapflip reviews
Humanity, left to its own devices for centuries, comes into contact with the Citadel Council. A misunderstanding leads to hostile first contact, and the UNSC is drawn into war with the Council shortly after the Insurrection's height. The Council finds itself face-to-face with a species that has broken the shackles of Mass Effect Technology. The Era of Humanity has only just begun.
Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 73,932 - Reviews: 733 - Favs: 2,590 - Follows: 3,429 - Updated: 11/27/2021 - Published: 7/14/2017 - Master Chief/John-117, J. Keyes, Miranda L., Shepard
Star League of the Orion Arm Codex by Reichenfaust reviews
Megaverse. A grand vision, on how Mass Effect, and others will be affected by a humanity forged from the influences of 1980's-2000's Sci-Fi and such. How will the Citadel deal with a humanity that has seen and has Cyborgs, Super-Soldiers, BattleMech's, WarShips, with more to come? Will contain dossiers on factions, weapons, characters, and such as we go.
Rated: T - English - Sci-Fi/Fantasy - Chapters: 3 - Words: 73,229 - Reviews: 41 - Favs: 169 - Follows: 185 - Updated: 11/26/2021 - Published: 12/25/2016
Catalog of War by hunter 139 reviews
A collection of one shots about events, including battles, conflicts and skrimishes, that occur in the shared multiverse of my stories. I do not own any of the franchises that appear in this series. Multicrossover.
Rated: T - English - Sci-Fi - Chapters: 28 - Words: 67,362 - Reviews: 26 - Favs: 39 - Follows: 37 - Updated: 11/13/2021 - Published: 4/21/2015
Operation Phoenix & Raven by Ordo Warrior reviews
Continuing from Best of Spartans and Spectres. Commander Shepard has been captured and Noble Six turns to the one group that can help save her, but will that help come at too great of a cost?
Rated: M - English - Chapters: 53 - Words: 175,250 - Reviews: 92 - Favs: 194 - Follows: 239 - Updated: 11/12/2021 - Published: 10/21/2014 - SPARTAN-B312/Noble Six, J. Garson - Complete
For Earth and All Her Colonies by GADPELLAEON reviews
Post Human-Covenant War AU. After the Great War, all the UNSC wants to do is rebuild and live in the peace. A peace that so many died for. What happens when they learn that no matter what, war will always find them. Chapters Updated - Chapter 11 uploaded (07/08/2019) Any criticism and/or tips welcome.
Rated: T - English - Sci-Fi - Chapters: 13 - Words: 80,854 - Reviews: 519 - Favs: 1,723 - Follows: 2,355 - Updated: 10/14/2021 - Published: 12/27/2018 - Master Chief/John-117, Arbiter, J. Garson, Councilor Tevos
Faction Death Battle by Konradoziom reviews
Death Battle, but between factions. Factions may not necessarily come from the HALO or MassEffect universes. You can ask fort factions you want to fight with each other in the comments. I found something like that on YouTube and decided to do it myself, on fanfiction, although on YouTube it was called otherwise, 'Faction Compare', I think.
Rated: K+ - English - Fantasy/Sci-Fi - Chapters: 3 - Words: 5,100 - Reviews: 15 - Favs: 18 - Follows: 11 - Updated: 10/13/2021 - Published: 4/19/2021
Mass Effect: Wayward Souls (rewrite pending) by ChroniclerofChaos07 reviews
No one knew what would really happen when the slipspace bomb detonates. All they know is that whatever gets caught in it would be sent to "oblivion". No one expected what would happen when you mess with the 11 dimensions of splipspace. Now Noble Six faces a new galaxy along side two other "Six's", three Jorge's, a surviving team of ODSTs, and the sole survivor of The Savannah.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 19,484 - Reviews: 44 - Favs: 210 - Follows: 296 - Updated: 10/4/2021 - Published: 3/17/2021 - Jorge-052/Noble Five, SPARTAN-B312/Noble Six, Shepard
Reckoning of the Reclaimers (Being Rewritten) by metts101 reviews
The Great War turned Humanity into something ugly. Their species' brush with extinction left a bitter taste in their mouths and they sought to rectify that the only way they knew how. Revenge. With the the subjugation of the Former Covenant species Humanity vowed never to fall to the alien again, but will an Alliance of Alien species change their outlook on the galaxy?
Rated: T - English - Sci-Fi - Chapters: 6 - Words: 41,721 - Reviews: 84 - Favs: 301 - Follows: 392 - Updated: 9/22/2021 - Published: 11/14/2020
Mass Effect: Lost Son of Terra by Ares007 reviews
The Reapers had a system. They let Civilizations grow, then harvested once they were at their peak. What will happen when a wrench is thrown into that system in the form of Erwin Wolff. A broken man whose sole purpose was to kill Xenos. Pulled into a Xenophilic Galaxy. How will he deal with the Mass Effect trap and navigate new aspects of his life?
Rated: M - English - Adventure/Romance - Chapters: 12 - Words: 122,661 - Reviews: 36 - Favs: 208 - Follows: 263 - Updated: 9/21/2021 - Published: 6/29/2021 - [SPARTAN-B312/Noble Six, Oriana L.] [Shepard, Miranda L.]
Ascendant by evevee reviews
A single ship can change a galaxy. The Normandy had already proven that, yet much like that vessel this new wreck was also dead. So it seemed at first at least, but just because something is dead does not mean it is forgotten.
Rated: K+ - English - Sci-Fi - Chapters: 5 - Words: 38,561 - Reviews: 215 - Favs: 736 - Follows: 726 - Updated: 9/18/2021 - Published: 8/21/2021 - Liara T'Soni - Complete
The Might of Humanity by Builder of Stories reviews
Humanity moving much more quickly has changed everything. Their early development and discoveries propelled themselves into the future with peace in one hand and their might ready in the other. Is the galaxy ready, for a powerful Humanity
Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 6,980 - Reviews: 36 - Favs: 318 - Follows: 458 - Published: 9/3/2021 - [Tali'Zorah, Miranda L., Shepard] C. Halsey
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