Halo and Mass Effect Crossovers
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HALO Mass convergence by SapphireDawn11709 reviews
Two Universe collide after the Forerunners fall and the Reapers return, will the two branches of Humanity placed in their respective Systems by a Forerunner Monitor unite or fall, only time will tell in this epic clash. When the UNSC Exploration and Research Vessel Light of Sol discover a strange artifact, they are opened up to the rest of the Galaxy after millennia of isolation.
Rated: M - English - Sci-Fi - Chapters: 23 - Words: 79,389 - Reviews: 302 - Favs: 670 - Follows: 853 - Updated: 2/20 - Published: 9/18/2016 - Master Chief/John-117, Cortana, J. Garson, Tali'Zorah
Audax Novus by A-01 reviews
A bold new world - A strange new reality - Fresh trials, tribulations, allies, and enemies. John fell through the portal from the Mantles Approach, but his luck works in mysterious ways. Now stranded in an alternate reality, how will he strive forward? The galaxy takes a sharp turn from the world we know, and the Reaper threat looms just as large, but no longer so uncontested.
Rated: M - English - Adventure/Romance - Chapters: 25 - Words: 656,164 - Reviews: 748 - Favs: 1,507 - Follows: 1,903 - Updated: 2/17 - Published: 9/4/2020 - [Master Chief/John-117, Miranda L.] [Shepard, Tali'Zorah]
The Unknown Defender by Gabenator5 reviews
While Shepard is closing in on Saren, something odd is happening in the Terminus systems. A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases going dark, both the enslaved and kidnapped alike are discovered free. Who are these new interlopers and what is their goal? For good or ill the powers that be intend to find out.
Rated: T - English - Adventure/Sci-Fi - Chapters: 18 - Words: 121,911 - Reviews: 1305 - Favs: 3,553 - Follows: 4,524 - Updated: 1/16 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
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: 233 - Favs: 418 - Follows: 480 - Updated: 1/13 - Published: 7/28/2012 - Didact
No Greater Calling by silencewillfall0091 reviews
Because here's the thing. Turians, despite their reputations, had never loved war- not the suffering, the dying, nor the pain. They loved victory- the prevailing of clear good over clear evil- justice winning in the end, the beating of overwhelming odds for peace. And there was never more a clear example of this type of war than ours against the Covenant.
Rated: T - English - Sci-Fi - Chapters: 2 - Words: 3,304 - Reviews: 34 - Favs: 158 - Follows: 281 - Updated: 1/11 - Published: 1/7
Accounts of the Flood conflicts by hunter 139 reviews
A multicrossover series of one-shots depicting several franchises and their encounters with the Flood. I do not own Halo or any other franchises depicted in these stories.
Rated: T - English - Horror/Sci-Fi - Chapters: 40 - Words: 98,854 - Reviews: 203 - Favs: 166 - Follows: 180 - Updated: 1/8 - Published: 1/15/2015 - Gravemind
Voyage unto Infinity by supertruckin reviews
The USS Voyager comes face to face with the massive ship that is the UNSC Infinity after Voyager's nearly fatal first test of their quantum slipstream drive. Getting home isn't their only issue. They will have to work together in order to unravel the ancient threat that plagues the new galaxy that they find themselves in. Star Trek:Voyager, Mass Effect, and Halo triple crossover
Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 79,399 - Reviews: 613 - Favs: 1,553 - Follows: 2,040 - Updated: 1/2 - Published: 4/10/2019 - Master Chief/John-117, Cortana, Shepard
The Halo Effect: War and Civilization by free man writer reviews
A crossover years in the works. Civilizations rise and fall but to those that do stand, they prosper. They Expand. They reach out across the stars. But of course, such is a Universal law, War is never far behind. War is a language all civilized races speak and it is war most are familiar with. Co-written with BulletStormX. Halo/Mass Effect with a dash of Star Wars.
Rated: M - English - Sci-Fi/Adventure - Chapters: 12 - Words: 120,081 - Reviews: 316 - Favs: 668 - Follows: 879 - Updated: 12/28/2021 - Published: 7/28/2020
It Started At Shanxi by SpaceTurtleOX reviews
Fifty years after the end of the Human-Covenant War an ill-fated UNSC expedition opens Relay 314, revealing a civilization unprepared for their arrival, and relics from a terrible past.
Rated: T - English - Sci-Fi/Adventure - Chapters: 16 - Words: 81,162 - Reviews: 552 - Favs: 1,666 - Follows: 2,524 - Updated: 12/27/2021 - Published: 7/26/2019 - Master Chief/John-117, Cortana, Zaeed M., OC
The Exiles:A New Power by Johnnieboy11 reviews
The beginning of the Battle For Earth signaled the start of the final, bloodiest campaign of the Human-Covenant War. Hastily, a plan is put into motion and an Ark Fleet, composed of a dozen Phoenix-class vessels and their escorts, makes the jump out of system. Either interference, or malfunction, causes their arrival to a new Galaxy, where new threats lurk just around the corner.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 5,005 - Reviews: 29 - Favs: 178 - Follows: 281 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
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: 70 - Favs: 246 - Follows: 348 - 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: 66 - Favs: 185 - Follows: 235 - 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: 4 - Favs: 16 - Follows: 17 - 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: 7 - Follows: 12 - Published: 12/16/2021 - [Shepard, Garrus V.] [SPARTAN-B312/Noble Six, OC]
The Truth About 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: 222 - Follows: 319 - Updated: 12/16/2021 - Published: 4/10/2019 - Librarian, Didact, OC, Shepard
Mass Effect: Spartans of the UNSC Stormbringer by Beowolf 43
first chapter is summery.
Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 210 - Favs: 7 - Follows: 12 - Published: 12/3/2021
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: 719 - Favs: 2,422 - Follows: 3,239 - 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: 40 - Favs: 151 - Follows: 163 - Updated: 11/26/2021 - Published: 12/25/2016
A Whole New World by Spartan III Commando reviews
Noble six's story did not end on Reach, he escaped the doomed planet after saving the Pillar of Autumn, and he and 117 fought across each Halo, until an incident sent him to a whole new world. And he is wholly unprepared for the journey in store.
Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 23,430 - Reviews: 38 - Favs: 203 - Follows: 294 - Updated: 11/18/2021 - Published: 7/7/2016 - SPARTAN-B312/Noble Six
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: 25 - Favs: 37 - Follows: 35 - 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: 91 - Favs: 183 - Follows: 235 - Updated: 11/12/2021 - Published: 10/21/2014 - SPARTAN-B312/Noble Six, J. Garson - Complete
Daily war with monster girls by Masterdude21 reviews
With the help of the highly-motivated extra-species in the military, mankind holds their own against the brutal onslaught of the Covenant. In their haste to close the gap in space warfare, ONI stumbles upon Relay 314. Even as new enemies arise, the galaxy constantly thwarts Cortana's schemes to build the Master Chief the ultimate harem. Halo/Mass Effect/Monster Musume crossover.
Rated: M - English - Humor/Romance - Chapters: 26 - Words: 351,652 - Reviews: 1019 - Favs: 1,936 - Follows: 2,213 - Updated: 11/9/2021 - Published: 9/20/2016 - Master Chief/John-117, Cortana, Shepard
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: 503 - Favs: 1,521 - Follows: 2,143 - 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: 14 - Favs: 14 - Follows: 10 - Updated: 10/13/2021 - Published: 4/19/2021
The Adventures of the Lucen: The VykurCorp Conspiracy by General Rage reviews
Liara T'Soni continued her mission to protect the Galaxy while Commander Shepard is in another dimension. She must stop the Covenant and the allies they've gathered from wreaking havoc in a Galaxy without it's greatest hero. While she's had some success, there's a gathering storm on the horizon and one of her crew of misfits will be forced to confront her past before it clears.
Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 214,973 - Reviews: 155 - Favs: 125 - Follows: 131 - Updated: 10/8/2021 - Published: 6/26/2016 - OC, Liara T'Soni, U. Wrex
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