Halo and Mass Effect Crossovers
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The Unknown Defender by Gabenator5 reviews
A new faction stirs, its green-clad enforcers seemingly unstoppable. Rumors spread, pirate bases go dark, and both the enslaved and kidnapped 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. REWORK COMPLETED.
Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 153,359 - Reviews: 1495 - Favs: 4,190 - Follows: 5,246 - Updated: 7/30/2023 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
Unknown events have unmeasurable answers by El callampas reviews
When someone contacts the Quarians about old machinery, they should think twice before engaging with a strange yet so familiar species, a war, and circumstances that will shock two galaxies now that the rift is open.
Rated: T - English - Sci-Fi/Drama - Chapters: 19 - Words: 171,948 - Reviews: 347 - Favs: 589 - Follows: 824 - Updated: 6/25/2023 - Published: 4/21/2022 - [Master Chief/John-117, Tali'Zorah] J. Cutter
On the Shoulders of Giants by Shoot The Runner reviews
Two galaxies thrown together by a cosmic fluke. On one side of the galaxy, the war-weary UNSC vows to rebuild and become a giant in the stars so that they will never be so helpless again. Whilst another humanity is still finding its feet in the Citadel, with treachery and politics hindering its progress. How does the merging of two galaxies impact the course of all of their fates?
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 9,844 - Reviews: 46 - Favs: 296 - Follows: 418 - Published: 6/20/2023 - Master Chief/John-117, T. Hood, Shepard, D. Udina
Daily War With Shipgirls by Starco101 reviews
Story inspired by “Daily War With Monster Girls”! In the midst of the cruel Human-Covenant War, a new type of intelligence was created. Artificial constructs armed with the power of warships compressed into the size of human girls called “ship girls”. Can humanity’s greatest heroes keep their sanity with these unlikely companions? Halo/Mass Effect/Monster Musume crossover!
Rated: M - English - Adventure/Mystery - Chapters: 1 - Words: 6,206 - Reviews: 6 - Favs: 40 - Follows: 52 - Published: 5/21/2023 - Master Chief/John-117, OC, Cortana, Shepard
Un grand angle d'ombre by blackshamrock333 reviews
2560. L'humanité a survécu à la grande guerre contre les covenants et découvert l'espace concilien. Le Longest Day, prowler de l'UNSC en mission secrète, débarque en pleine attaque d'une colonie frontalière. Quelques jours plus tard, un médecin humain est découvert assassiné sur la Citadelle. Deux événements aléatoires, annonciateurs d'une course pour sauver la galaxie.
Rated: T - French - Sci-Fi/Adventure - Chapters: 3 - Words: 35,362 - Reviews: 3 - Favs: 7 - Follows: 11 - Updated: 5/9/2023 - Published: 1/27/2023
A Galaxy of Inheritors and Usurpers by HaloZealotDemon reviews
The Separatists destroy the Covenant in a brutal war, yet in the 2570s they still persist in their efforts, but in two years they will be snuffed out. However The Gods have other plans. The Migrant fleet decides to escape through Relay 314 into unknown space, but instead meet "Sleep-deprived Titans with negative zero fucks to give." -LTCOL Church. Heavy AU, Rvb elements, swearing.
Rated: M - English - Sci-Fi/Drama - Chapters: 2 - Words: 17,488 - Reviews: 72 - Favs: 331 - Follows: 475 - Updated: 4/29/2023 - Published: 12/25/2022 - Arbiter, T. Hood, Tali'Zorah, Councilor Sparatus
A fanfic idea of mine by Fantasy-and-SciFi-Lover reviews
Posting in both fanfiction and crossover sections.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 624 - Reviews: 4 - Favs: 3 - Follows: 5 - Published: 4/24/2023
Anomaly Effect by Mr Ragnarok reviews
La Ciudadela es el centro de la civilización galáctica, un lugar donde conviven diferentes especies diferentes en armonía.Un día, unas naves de la Ciudadela desaparece durante una prueba de un nuevo motor FTL. Los rastreadores indican que ha saltado a un sistema estelar desconocido. Los líderes de la Ciudadela deciden investigar, encontrandoce con algo inaudito.
Rated: M - Spanish - Chapters: 2 - Words: 2,746 - Reviews: 5 - Favs: 18 - Follows: 21 - Updated: 4/23/2023 - Published: 4/18/2023
Mass Effect: Spartans of the UNSC Stormbringer by Beowolf 43 reviews
first chapter is summery.
Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 1,035 - Reviews: 3 - Favs: 9 - Follows: 19 - Updated: 4/12/2023 - Published: 12/3/2021
Operation Hidden Paths: A Halo-Mass Effect Crossover by pj6778457 reviews
story of a new universe where the System Alliance has been replaced by the Unified Earth Government (UEG). Set in the worlds of Halo and Mass Effect
Rated: T - English - Adventure - Chapters: 1 - Words: 1,525 - Reviews: 14 - Favs: 66 - Follows: 118 - Published: 4/11/2023
Crucible of Clans by Lighting wolf knight
He would have his revenge upon Atriox And he might up even doing things he didn't expect. Rated T for violence, death, and profanity
Rated: T - English - Sci-Fi/Mystery - Chapters: 1 - Words: 814 - Favs: 2 - Follows: 3 - Published: 4/11/2023 - OC, Atriox, Liara T'Soni, O. Petrovsky
House divided by Lighting wolf knight
Leading a house was hard. Leading one in a new galaxy? Even harder. Rated T for violence, death, and profanity.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 803 - Favs: 4 - Follows: 3 - Published: 4/11/2023 - OC, Warden Eternal, Tali'Zorah, Illusive Man
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: 41 - Words: 103,318 - Reviews: 215 - Favs: 187 - Follows: 203 - Updated: 3/17/2023 - Published: 1/15/2015 - Gravemind - Complete
Drop into Hell by Lighting wolf knight reviews
They have a lot more to do before its done. Rated T for violence, death, and profanity.
Rated: T - English - Adventure/Romance - Chapters: 3 - Words: 11,962 - Reviews: 1 - Favs: 18 - Follows: 27 - Updated: 3/8/2023 - Published: 2/3/2023 - Miranda K., OC, Admiral Hackett, Shepard
The Reclamation by Fade Maybe reviews
Through ONI's manipulation, the UNSC stumbles upon a Mass Relay and is dragged into a new war. They'll discover the battered races of the Citadel, the political intrigue of its factions, and a second group of humans governed by the Systems Alliance, divided by Cerberus, and lead by Commander Shepard. Yet no one can stop what is to come: the Reclamation, and the death of the galaxy.
Rated: T - English - Drama/Suspense - Chapters: 55 - Words: 409,476 - Reviews: 1682 - Favs: 1,849 - Follows: 2,270 - Updated: 2/27/2023 - Published: 3/13/2013
On the Illusion of Might by evevee reviews
We thought ourselves powerful, able to conquer a galaxy with nothing but toys. When we overcame every challenge, breached the space between the galaxies themselves, what use were the words of a race ashamed of their own past? Yet we cannot deny that we were warned, for while a challenge to a human is laughable, a challenge to humanity is a death sentence.
Rated: M - English - Sci-Fi - Chapters: 27 - Words: 297,181 - Reviews: 2137 - Favs: 4,024 - Follows: 5,035 - Updated: 2/21/2023 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Garrus V., Shepard
Operation Terra Sunrise HALO ( AU) x ME ( AU) by SimplyLaggy reviews
The Endless Swarm, known as the Reapers. Mostly defeated by the forerunners, yet after the death of almost all forerunners, they return. Now, the Reclaimers face them. Join Rebecca Shepard, a OMI Long-term undercover operative, as she goes undercover as Jane Shepard on Terra, Systems Alliance Earth, which was made by Ancient Humanity, as a ancient human remnant AI watches.
Rated: T - English - Chapters: 2 - Words: 4,521 - Reviews: 7 - Favs: 65 - Follows: 90 - Updated: 2/16/2023 - Published: 2/9/2023 - Illusive Man, Shepard
The USSC: A Timeline by SimplyLaggy reviews
A timeline of my USSC fanfic base. Feel free to use what's inside, but please gib me credit : REVAMP OUT 28/2/23 ENJOY
Rated: T - English - Sci-Fi - Chapters: 1 - Words: 1,628 - Reviews: 2 - Favs: 19 - Follows: 16 - Published: 2/8/2023
Lost Son of Terra Phoenix by Ares007 reviews
For eons past, they enjoyed the harvest of their farms. Countless civilizations breathed life because they allowed it. Now, they will die because he demands it. Halo/Mass Effect but with heavy elements from Warhammer 40k. M-Shep/Miranda, OC/Liara. HFY
Rated: M - English - Adventure/Romance - Chapters: 16 - Words: 116,869 - Reviews: 55 - Favs: 193 - Follows: 241 - Updated: 2/8/2023 - Published: 11/29/2021 - [SPARTAN-B312/Noble Six, Oriana L.]
United Earths Empire Rewrite by Destarien reviews
What if three Universes once separate come together? three different humanities with three different paths of technology merge into one galaxy. Citadel space will never be the same because the Schahl Empire and UNSC are here. Two Civilizations, one at war and one ready for war.
Rated: M - English - Adventure/Fantasy - Chapters: 2 - Words: 11,294 - Reviews: 15 - Favs: 122 - Follows: 158 - Updated: 1/31/2023 - Published: 1/5/2023
Immortal Galaxies by Lighting wolf knight reviews
An escape from an overrun galaxy lands them in another galaxy? What does being the biggest fish in the water gain you in a world without heavy hitters? Rated T for violence, death, and profanity.
Rated: T - English - Romance/Adventure - Chapters: 3 - Words: 4,777 - Reviews: 10 - Favs: 98 - Follows: 160 - Updated: 1/13/2023 - Published: 11/11/2021 - [OC, Vetra N.] T. Hood
United Earths Empire: The Beginning of a New Age by Destarien reviews
What if three Universes once separate come together. three different humanities with three different paths of technology merge into one galaxy. Citadel space will never be the same because the Schahl Empire and UNSC are here. Two Civilizations, one at war and one ready for war.
Rated: T - English - Fantasy/Sci-Fi - Chapters: 8 - Words: 21,362 - Reviews: 71 - Favs: 216 - Follows: 283 - Updated: 1/5/2023 - Published: 5/29/2022 - J. Keyes, J. Cutter, SPARTAN-B312/Noble Six, Jerome-092
Mass Effect Kills Halo by giblo126 reviews
I was frustrated and wanted to get something out.
Rated: K+ - English - Chapters: 1 - Words: 495 - Reviews: 31 - Favs: 2 - Follows: 2 - Published: 1/1/2023
Mass effect: the Jaded ones by Dozerrk reviews
A UNSC Human-covenant war-era battle group led by a Punic class supercarrier is introduced to a new galaxy. One where people are xenophilic, use to times of peace and harmony, and against disrupting the Status Quo. What will an extremely aggressive xenophobic and battle-hardened human faction add to the mix? and will their addition change the future of this galaxy. (No Spartans)
Rated: M - English - Adventure/Humor - Chapters: 5 - Words: 29,851 - Reviews: 71 - Favs: 188 - Follows: 269 - Updated: 12/25/2022 - Published: 2/6/2022 - E. Buck, OC
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: 4 - Words: 6,957 - Reviews: 98 - Favs: 457 - Follows: 706 - Updated: 12/4/2022 - Published: 1/7/2022
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