Halo and Mass Effect Crossovers
Filters
656 | « Prev Page 1 .. 2 3 4 5 6 7 8 15 .. Last Next »

Adeptum Effectus by Reddevel360 reviews
"Killing a man will harden you. Fighting a war against genocide will harden a species. Why are we so ruthless Councilor? Because when fighting for your very existence, anything is acceptable."-Lord Hood. Featuring a Humanity that discovered the archives on Mars in the midst of fighting an war for their very survival, a war that destined to be a massacre turns into a stalemate -Hia
Rated: M - English - Sci-Fi/Tragedy - Chapters: 14 - Words: 90,584 - Reviews: 920 - Favs: 2,700 - Follows: 3,510 - Updated: 8/19/2021 - Published: 5/10/2019 - Master Chief/John-117, T. Hood, Admiral Hackett, Councilor Sparatus
Final Reclamation Halo Wars by Harambe 117 reviews
master chief finds himself in a new galaxy with its own dark secrets lurking in black space. A new revelation is about to begin
Rated: M - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 14,072 - Reviews: 11 - Favs: 21 - Follows: 33 - Published: 8/5/2021
Rookies return by predator1701 reviews
Its been eight years since the end of the Reaper War, ten years since the creation of the Coalition. Now after many years of rebuilding Rookie is called back to command the Coalitions' latest exploration vessel. His mission, to explore strange new worlds, to seek out new life and new civilizations to boldly go into battle where none have battled before
Rated: T - English - Sci-Fi/Romance - Chapters: 1 - Words: 5,263 - Reviews: 1 - Favs: 10 - Follows: 11 - Published: 8/2/2021 - Complete
Once a Rookie, Always a Rookie by Twisted Fate MK 2 reviews
(Credit to Adrasos on Archive and his story, Prepare to Drop, for the idea.) On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, while Shepard tries to find and rescue the new Primarch. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix.
Rated: T - English - Adventure - Chapters: 62 - Words: 293,819 - Reviews: 608 - Favs: 1,247 - Follows: 1,455 - Updated: 7/31/2021 - Published: 9/27/2018 - Rookie, Shepard, Javik - Complete
The Lost Civilization by Apollonir reviews
After the Battle of the Ark, a UNSC Pelican dropship crash lands on Thessia. Two ODSTs survive the crash and make contact with primitive Asari. Ninety thousand years later, Liara T'Soni discovers a strange looking aircraft and Human remains in an ancient cave burial chamber. The discovery she makes will take the Asari on a journey to discover their true lineage.
Rated: T - English - Mystery/Suspense - Chapters: 16 - Words: 33,722 - Reviews: 675 - Favs: 2,054 - Follows: 2,849 - Updated: 7/26/2021 - Published: 7/2/2017 - Ashley W., Liara T'Soni, Mordin S., Shepard
Unforeseen turns of the war by Batrix2070 reviews
When everything seems to be going in the right direction Shepard learns of an old accident that forces him to seek allies in other universes.
Rated: T - English - Adventure/Sci-Fi - Chapters: 7 - Words: 38,284 - Reviews: 3 - Favs: 35 - Follows: 38 - Updated: 7/26/2021 - Published: 1/26/2021 - Master Chief/John-117, SPARTAN-B312/Noble Six, Admiral Hackett, Shepard
An Evolved Halo Effect by FallenDispair reviews
A crossover of Mass Effect and Halo. The Forerunners were masters of Mass Effect technology 100,000 years ago before being destroyed by the Reapers. In an effort to defeat the Reapers the Forerunners created new technology not dependent on element zero. Reseeding the Halo species with technology/resources they could use to defeat the Reapers. Better summary inside.
Rated: M - English - Fantasy/Adventure - Chapters: 1 - Words: 21,112 - Reviews: 13 - Favs: 118 - Follows: 143 - Published: 7/7/2021
The sacred path by Lighting wolf knight
To meet a being such as her? He did not understand. But their path? They walked it together.
Rated: T - English - Romance/Adventure - Chapters: 1 - Words: 803 - Favs: 9 - Follows: 10 - Published: 7/2/2021 - OC, Atriox, Daro'Xen
The ONI Way by Rookie1998 reviews
Arthur Ross a ONI Section Zero operative is transported to the Mass Effect universe to escape the Created, where he is quickly recruited by Cerberus believing in their goal of human dominance. Will he succeed in reclaiming Humanity's rightful place in the stars or fail like those before him.
Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 2,170 - Reviews: 8 - Favs: 45 - Follows: 62 - Published: 6/26/2021 - OC, Illusive Man, Miranda L.
The Damaged ODST by Rookie1998 reviews
A ODST is mysteriously transported to the Mass effect universe When a slip space accident occurs amidst the final evacuation of Reach. Will he be a help or hindrance in the fight to come? (All chapters rewritten.)
Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 16,003 - Reviews: 22 - Favs: 66 - Follows: 107 - Updated: 6/16/2021 - Published: 9/19/2019 - OC, Shepard
United we Stand by Mayto reviews
At the height of the Human Covenant war, another galactic power intervenes to aid the embattled humans. Standing side by side with the Turians, the UNSC prepares for a new phase of the Human Covenant war.
Rated: M - English - Sci-Fi - Chapters: 86 - Words: 308,563 - Reviews: 1482 - Favs: 1,463 - Follows: 1,729 - Updated: 6/6/2021 - Published: 3/26/2019
Unwavering Eagle by Crazzytony reviews
How far has Humanity truly come from it's humble beginnings, from once cavemen to those that can conquer the stars. For both were met with war yet one was welcomed into the fold while they other waged a hopeless war, and yet was able to survive. Now both and their allies now face a danger like none before, can they survive or will they meet extinction?
Rated: T - English - Sci-Fi - Chapters: 1 - Words: 2,445 - Reviews: 2 - Favs: 7 - Follows: 9 - Published: 5/6/2021 - Master Chief/John-117, Arbiter, Shepard - Complete
Effects of a Titan by greeneman42 reviews
A small salvage ship comes across an interesting find while searching. Set before Halo 4 and before ME 2
Rated: T - English - Adventure/Sci-Fi - Chapters: 31 - Words: 226,020 - Reviews: 1080 - Favs: 2,032 - Follows: 2,663 - Updated: 4/24/2021 - Published: 11/26/2013 - Master Chief/John-117, Cortana, J. Garson
Element Halo by Iron Warriors reviews
When we started to expand past the Orin Arm of the Milkyway, we didn't know what to expect. Once we were out there though, things changed big time. For those brief 30 years we were the top dogs of the galaxy in all powers but like always when humanity reaches a higher seat of power, something always comes to make us fall... This time however the fall will cost our entire race.
Rated: T - English - Sci-Fi - Chapters: 24 - Words: 89,050 - Reviews: 274 - Favs: 630 - Follows: 881 - Updated: 4/15/2021 - Published: 12/11/2017 - OC
Noble Tries To Go Home by The new god reviews
B312 gets sent to the Mass Effect galaxy, he tries to go home by building a slipspace drive but problems pops up as building a slipspace drive is by nomeans easy.
Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 5,412 - Reviews: 22 - Favs: 70 - Follows: 95 - Updated: 4/13/2021 - Published: 4/9/2021 - SPARTAN-B312/Noble Six, Shepard
The Sum is Greater than its Parts by Maersikai reviews
Having long since combined forces, a fleet of the Humans and Covenants finest are torn from the universe they know to be thrown in to a strange and desolate reality. They will strive to uphold the Mantle against the Mass Effect's most Ancient Enemy. Will they break the cycle?
Rated: T - English - Sci-Fi - Chapters: 20 - Words: 181,741 - Reviews: 414 - Favs: 1,241 - Follows: 1,467 - Updated: 4/8/2021 - Published: 3/2/2015 - Cortana, J. Garson
To Infinity by creamofwheat2311 reviews
After discovering an ancient artifact, the UNSC's most advanced warship and a Sangheili Assault Carrier are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined.
Rated: T - English - Sci-Fi/Adventure - Chapters: 53 - Words: 473,247 - Reviews: 4117 - Favs: 5,793 - Follows: 6,742 - Updated: 3/30/2021 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, Shepard
Broken Odyssey by Damie243 reviews
It is the year 3350, the races of the Milky Way have long put aside their grievances to unite under a single banner. They held on against dangerous threats and hoped to attain actual peace. After fighting the remnants of an extrgalactic empire, forces of the MWR shall be thrust into another galaxy that's so much like their own. A galaxy that just won its war for survival.
Rated: M - English - Sci-Fi/Drama - Chapters: 9 - Words: 43,306 - Reviews: 32 - Favs: 180 - Follows: 256 - Updated: 3/12/2021 - Published: 2/7/2020 - OC, Shepard
War, Peace, and other Galactic Customs by The Almighty Afroduck reviews
After a long, terrible war, the Federation of Sovereign Empires forms as the product of the alliance created early in the Great War between the Covenant Separatists and the UNSC. Time passes as they progress greatly, eventually discovering the existence of other galactic governments. The events that will follow will change the course of the galaxy in more ways than one. PART- 3
Rated: M - English - Sci-Fi/Adventure - Chapters: 36 - Words: 402,465 - Reviews: 768 - Favs: 1,429 - Follows: 1,697 - Updated: 3/7/2021 - Published: 3/1/2014
Wolf Effect by 182ndHelljumper reviews
A team of Spartan II's named Wolfpack go on adventure after the events of Halo 4 and Spartan Ops an anomaly causes them to get sent into the Mass Effect universe starting where it all began on Eden Prime and they run into and ally themselves with Cmdr Shepard and the Normandy crew, Can both the Spartans and the Normandy crew prepare themselves for what lies ahead of them?
Rated: M - English - Adventure/Romance - Chapters: 31 - Words: 77,289 - Reviews: 10 - Favs: 57 - Follows: 60 - Updated: 2/1/2021 - Published: 1/21/2021 - [Shepard, OC] Master Chief/John-117, C. Halsey
Folks Need Heroes by Bodacity2.0 reviews
A nuke, a slipspace portal, and a human digitizer - the perfect ingredients for the unexpected. Fortunately for Shepard and Co., a little unexpected, or in this case, a BIG unexpected, is just what this galaxy needs. Get ready to finish the fight, laser up, and give some people back their bombs.
Rated: T - English - Adventure/Sci-Fi - Chapters: 16 - Words: 115,804 - Reviews: 330 - Favs: 959 - Follows: 1,382 - Updated: 1/31/2021 - Published: 4/28/2020 - Master Chief/John-117, Miranda L., Shepard
Vanguard of The Great Journey by VaultoftheExalted reviews
The Covenant Empire discovers an ancient construct on the fringes of their domain. They interpret it as an ancient Forerunner slipspace device. Upon the destruction of a scout probe they send through the relay, they send Thel'Vadamee to the other side to secure the partner. 'Vadamee unknowingly takes the Fleet of Particular Justice into a galaxy embroiled in war with the Reapers.
Rated: T - English - Sci-Fi/Suspense - Chapters: 2 - Words: 6,721 - Reviews: 38 - Favs: 57 - Follows: 102 - Updated: 1/23/2021 - Published: 1/18/2021
Evolved Edge Effect by Nicogen reviews
Normally when one finds themselves in another world their life is going to be one filled with adventure. But after being hit by a train I found myself running for my life as the world exploded around me and literal monsters hunting me down. What's worse is that I just didn't find myself in a typical alternate universe. But a universe that was an amalgamation. MULTI X OVER SI.
Rated: M - English - Sci-Fi/Adventure - Chapters: 3 - Words: 17,879 - Reviews: 12 - Favs: 51 - Follows: 76 - Updated: 1/13/2021 - Published: 1/1/2021
The Spirit of Humanity by Kazlin reviews
After decades of ponderous travel through space the UNSC Spirit of Fire stumbles across the drifting tomb of Humanities greatest hero. Within the ship they find the means of possibly making it home, but to get there they will have to make alliances that could upend the balance of power in the Galaxy and change everything the Council races thought true.
Rated: M - English - Sci-Fi - Chapters: 5 - Words: 20,227 - Reviews: 204 - Favs: 875 - Follows: 1,363 - Updated: 1/5/2021 - Published: 5/24/2018
What Comes After Winter by JohnFlyer reviews
Down but not out after the fall of Reach, Noble Six is unwittingly sent to another reality. With Halsey as a nefarious ally, and ONI as a potential enemy, his loyalties are now split and he'll need help. He'll need to uncover a sinister plot transcending both worlds, battle foes near and far, and learn to work with unexpected and alien allies. Time to pick up a new team.
Rated: M - English - Adventure/Romance - Chapters: 6 - Words: 70,916 - Reviews: 68 - Favs: 264 - Follows: 362 - Updated: 12/19/2020 - Published: 2/7/2020 - SPARTAN-B312/Noble Six
656 | « Prev Page 1 .. 2 3 4 5 6 7 8 15 .. Last Next »