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The Rook by
Twisted Fate MK 2 reviews
On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, right in the midst of the Reaper War. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix. (Redo of an older story)
Crossover - Halo & Mass Effect - Rated: M - English - Adventure - Chapters: 38 - Words: 135,421 - Reviews: 219 - Favs: 698 - Follows: 984 - Updated: 19h - Published: 7/8/2022 - Rookie, Shepard
Age of Monsters - A Warhammer 40k-Godzilla crossover by
Zillafire101 reviews
In the shadows of a world ravaged by the war, the inhabitants of the Millennium of Only War, learn that there is much of Terra's ancient past best left forgotten...
Crossover - Godzilla & Warhammer - Rated: T - English - Sci-Fi/Mystery - Chapters: 12 - Words: 227,329 - Reviews: 53 - Favs: 81 - Follows: 97 - Updated: 2/6 - Published: 4/17/2024 - King Ghidorah, Godzilla, Chaos Space Marines, Space Marines
The Path of the Savior by
Johnnieboy11 reviews
Trapped in another variation of the Milky Way Galaxy after the Fall of Cadia caused the opening of the Cicatrix Maledictum, a minor Eldar Craftworld finds itself stuck in a war between a humanity on the brink of extinction and an alien alliance hell-bent on ending them and the Humans. Unlikely alliances form, friendships are built and the face of the Galaxy will forever be changed
Crossover - Warhammer & Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 16 - Words: 62,598 - Reviews: 232 - Favs: 789 - Follows: 1,026 - Updated: 10/27/2024 - Published: 8/12/2019 - Eldar, Master Chief/John-117, A. J. Johnson, OC
The Call to War by
silencewillfall0091 reviews
In 2550 CE, 25 years into our war with the Covenant, a Turian fleet exploded out of the ice moon orbiting Lusitania. The Hierarchy, aching for a war since the humiliation of the Rachni invasion, stumbled into the most brutal conflict in recent galactic history.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 2,164 - Reviews: 13 - Favs: 57 - Follows: 83 - Published: 2/2
The Song of Infinity by
Johnnieboy11 reviews
As the battle of Christophsis is ongoing, a new faction emerges over the crystalline battlefield. Confusion, worry and fear permeate the Republic lines until a first shot is fired in anger by the Confederacy. A change stirs in the Force, the Reclaimers are awakening and the Galaxy at large is powerless to stop them.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 36 - Words: 148,218 - Reviews: 254 - Favs: 917 - Follows: 1,120 - Updated: 1/13 - Published: 3/23/2023 - Anakin Skywalker, Ahsoka T., Master Chief/John-117, T. Lasky
Echoes of the Forerunners: A Covenant Unveiled by
Phorus Aedelmaer reviews
The Covenant War erupts with far-reaching consequences across two universes. As the UNSC struggles to survive, they form an unexpected alliance with the species of the Citadel Council. Creative liberties will be taken with the timelines, events, and characters of both franchises.
Crossover - Halo & Mass Effect - Rated: K+ - English - Sci-Fi - Chapters: 17 - Words: 33,312 - Reviews: 159 - Favs: 185 - Follows: 265 - Updated: 1/4 - Published: 9/8/2024
Remnants by
General Rage reviews
From Halo's ashes, a mismatched Alliance is born. UNSC soldiers now serve alongside both Batarian deserters and shifty Jackal Space Pirates. Now Shepard and Master Chief have to keep these strange bedfellows from killing one another before they can stop an emergent new threat to the galaxy. The Next Swashbuckling Chapter of the Wormhole Chronicles.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 51 - Words: 1,080,049 - Reviews: 945 - Favs: 648 - Follows: 723 - Updated: 12/7/2024 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 32 - Words: 130,420 - Reviews: 552 - Favs: 1,198 - Follows: 1,679 - Updated: 11/7/2024 - Published: 12/26/2021 - OC, Tali'Zorah, Admiral Hackett, Rael'Zorah
The Galaxy is Flood, Not Food by
JacksonTheFox reviews
It is the 42nd Millennium. The Imperium spans the galaxy, yet it has been split in two by Chaos after the opening of the Great Rift. Yet, with the tear in reality, something unexpected emerged. A man, born in another time, arrives not as himself, but as a spore of the most terrible of parasites. The Flood has come to Warhammer 40k.
Crossover - Warhammer & Halo - Rated: T - English - Sci-Fi/Horror - Chapters: 67 - Words: 256,635 - Reviews: 62 - Favs: 307 - Follows: 331 - Updated: 10/16/2024 - Published: 9/10/2024 - Chaos Space Marines, Daemons, Inquisition, Adeptus Mechanicus
Odyssey of the Untrodden by
RamPluto reviews
After centuries of relative peace and isolation, the races of Citadel Space have decided to make the bold and historic step of activating a dormant Relay. Unknowing stumblingly into a war that will change the shape of the entire galaxy.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 8,806 - Reviews: 57 - Favs: 216 - Follows: 350 - Updated: 10/5/2024 - Published: 10/1/2024 - Master Chief/John-117, Garrus V., Tali'Zorah, Liara T'Soni
The Great War by
Forgotten Trooper reviews
The Galactic Empire is a Beast, but the beast is blind, and it will soon find itself dragged into conflict with unforeseen enemies and unusual allies. The UNSC is losing the war to the Covenant, and the Prophets consolidate their power over their Dominion. These Gargantuan forces will collide in a war that will leave the galaxy forever changed.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 23,248 - Reviews: 59 - Favs: 124 - Follows: 195 - Updated: 9/10/2024 - Published: 8/13/2023 - Darth Vader, Prophet of Truth, P. Cole
The Sins of our Fathers by
MarkerMagnum reviews
Unknown to the Citadel Council, the Human-Covenant war nears its vicious end. Miranda Keyes is seconds too slow. Delta Halo fires, leaving UNSC space as a lifeless snapshot in time. The Citadel must morn the loss of a civilization they never knew.
Crossover - Halo & Mass Effect - Rated: T - English - Drama/Sci-Fi - Chapters: 14 - Words: 147,748 - Reviews: 600 - Favs: 1,681 - Follows: 2,220 - Updated: 9/1/2024 - Published: 2/11/2023 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
Enduring the Flames of War by
Masterdude21 reviews
A joint Asari-Turian operation salvaged a "package" from a derelict wreckage in the Terminus Systems, whereupon they release a force of war beyond their reckoning. Hoping to avoid another war, Commander Shepard recruits the "package" into her team. A simple act of kindness, unwittingly paving the way for a clash unlike the galaxy has ever seen. Fate directs the flames of war.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 51 - Words: 766,431 - Reviews: 2639 - Favs: 4,203 - Follows: 5,037 - Updated: 8/31/2024 - Published: 11/30/2015 - Master Chief/John-117, OC, Shepard
The Wreck by
Gabenator5 reviews
After the destruction of the Normandy, Tali'Zorah sets out to explore the lesser-explored regions of the galaxy in search of rare materials for the Migrant Fleet. During her adventures, she stumbles upon something that shouldn't exist within her universe. The galaxy will never be the same...
Crossover - Halo & Mass Effect - Rated: T - English - Fantasy/Sci-Fi - Chapters: 8 - Words: 25,101 - Reviews: 441 - Favs: 1,427 - Follows: 2,064 - Updated: 5/11/2024 - Published: 1/7/2018 - Tali'Zorah
Always Be a Good Boy by
Anquietas reviews
A Spartan and his A.I. companion will stumble across the Colonies of Kobol just a few days before the Cylon attack. That is where our story will truly begin.
Crossover - Halo & Battlestar Galactica: 2003 - Rated: T - English - Sci-Fi/Adventure - Chapters: 12 - Words: 78,231 - Reviews: 102 - Favs: 170 - Follows: 262 - Updated: 4/21/2024 - Published: 12/26/2023 - OC, W. Adama, L. Adama/Apollo, K. Thrace/Starbuck
Mass Effect: Forward Unto Dawn by
WildcatWarrior67 reviews
Spartans never die. They're just missing in action. At least, that's how the saying goes. But for the Master Chief and Cortana, they're no longer missing. Awaking in a different universe, the two of them will uphold their oath: to protect Earth and all her colonies. Only it won't be from the Covenant this time.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 10,714 - Reviews: 50 - Favs: 264 - Follows: 448 - Updated: 3/20/2024 - Published: 11/26/2022 - Master Chief/John-117, Cortana, Shepard
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.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Romance - Chapters: 26 - Words: 656,439 - Reviews: 831 - Favs: 1,914 - Follows: 2,343 - Updated: 3/2/2024 - Published: 9/4/2020 - [Master Chief/John-117, Miranda L.] [Shepard, Tali'Zorah]
War of the Old Ones by
Ian the Mechanic reviews
In forgotten ages past, two near eldritch forces vied for the very life essence of the Galaxy. Unknown to the young races, that war is still ongoing. how can the UNSC, the Citadel Council or the Covenant hope to stand against such forces, when they are still embroiled in their own petty squabbling? How could they hope to survive the War of the Old Ones?
Crossover - Mass Effect & Halo - Rated: M - English - Sci-Fi/Horror - Chapters: 28 - Words: 155,737 - Reviews: 178 - Favs: 364 - Follows: 533 - Updated: 2/7/2024 - Published: 2/21/2022
The Sword of the Geth by
Doctor poo and the TURDIS reviews
Dying on Mantle's Approach, Cortana wakes up in an unfamiliar environment. In her drive to get home, she 'employs' the assistance of the local synthetics. She never wanted to be a galactic overlord. But a UNSC AI in an environment woefully unprepared for one of her caliber makes an easy one.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 23 - Words: 123,604 - Reviews: 624 - Favs: 1,503 - Follows: 2,094 - Updated: 2/4/2024 - Published: 11/23/2023 - Cortana, Shepard
All the Stars by
BlueWay reviews
When the Long Night of Solace is evaporated over Reach via the weaponized usage of a Slipspace Drive, it ferries with it in its swallowed sections the Covenant Empire and, more horrifyingly, the desperate measures that the UNSC used to fight them. When they are found in a universe on the precipice of their own history, the meaning of the term "Mass Effect" will change forever.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 46 - Words: 802,179 - Reviews: 1353 - Favs: 1,995 - Follows: 2,377 - Updated: 11/9/2023 - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie, Shepard
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.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 17 - Words: 90,290 - Reviews: 663 - Favs: 2,034 - Follows: 2,990 - Updated: 9/16/2023 - Published: 7/26/2019 - Master Chief/John-117, Cortana, Zaeed M., OC
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.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 153,324 - Reviews: 1534 - Favs: 4,383 - Follows: 5,474 - Updated: 7/30/2023 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
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.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 6,957 - Reviews: 100 - Favs: 477 - Follows: 726 - Updated: 12/4/2022 - Published: 1/7/2022
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 73,932 - Reviews: 738 - Favs: 2,623 - Follows: 3,459 - Updated: 11/27/2021 - Published: 7/14/2017 - Master Chief/John-117, J. Keyes, Miranda L., Shepard
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
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Tragedy - Chapters: 14 - Words: 90,584 - Reviews: 930 - Favs: 2,748 - Follows: 3,553 - Updated: 8/19/2021 - Published: 5/10/2019 - Master Chief/John-117, T. Hood, Admiral Hackett, Councilor Sparatus
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 86 - Words: 308,563 - Reviews: 1488 - Favs: 1,499 - Follows: 1,761 - Updated: 6/6/2021 - Published: 3/26/2019
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.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 53 - Words: 473,247 - Reviews: 4125 - Favs: 5,874 - Follows: 6,816 - Updated: 3/30/2021 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, Shepard
The Howling Dark by
smart grid reviews
Two years have passed since the dark day that humanity's best was extinguished. Now it appears that the dead Shepard is not so dead, and that the enemies Jorge helped defeat, are not so defeated. Shepard is going to need humanity's best to take on the genocidal threat of the Collectors. Fortunately for her, Jorge has volunteered to help.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 7 - Words: 24,941 - Reviews: 159 - Favs: 664 - Follows: 905 - Updated: 5/12/2020 - Published: 3/4/2019 - Jorge-052/Noble Five, Shepard
The Spartan Effect by
Gatekeeper333 reviews
Everyone's favorite Spartan is looking for a new purpose, lucky for him, the Commander his happy to oblige. (5-23-19 Info: On Hiatus after Chapter 45. Will update with schedule after life is in order.)
Crossover - Halo & Mass Effect - Rated: T - English - Chapters: 45 - Words: 495,928 - Reviews: 1774 - Favs: 2,935 - Follows: 3,444 - Updated: 5/23/2019 - Published: 3/27/2011 - Master Chief/John-117, Tali'Zorah, Miranda L., Shepard
The Fighting Spirit by
smart grid reviews
Spartans never die, they say. When Jorge gave his life to save his home planet of Reach, he never imagined that he would survive. But now he finds himself neck deep in the troubles of another universe; he will do what he has been trained to do, what all Spartans do best: fight.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure - Chapters: 40 - Words: 176,374 - Reviews: 822 - Favs: 1,637 - Follows: 1,535 - Updated: 3/4/2019 - Published: 12/1/2011 - Jorge-052/Noble Five, Shepard - Complete
Mass Effect: Clash of Civilizations by
Eterna1Soldier reviews
In 2157 a Citadel Council exploratory vessel is tasked with opening a dormant Relay into unknown regions of the galaxy. What they find is something they never expected. What happens when two civilizations centered around different technologies clash?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Mystery - Chapters: 21 - Words: 96,812 - Reviews: 3528 - Favs: 6,142 - Follows: 7,045 - Updated: 5/22/2016 - Published: 10/13/2011 - Tali'Zorah
Guilty Sparks by
General Rage reviews
Fleeing from the glassing of Reach in the belly of the Pillar of the Autumn, the crew of the SR-2 Normandy find themselves stranded with their UNSC allies on a strange Forerunner constructed ring world called Halo with the Covenant hunting them. But Halo holds a secret, one deadlier than both the Covenant and Reapers combined... and it's hungry.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 38 - Words: 890,061 - Reviews: 1040 - Favs: 848 - Follows: 735 - Updated: 1/28/2015 - Published: 11/5/2012 - Master Chief/John-117, Shepard - Complete
Halo Colonial Horizon by
SpaceCowboy2013 reviews
A UNSC Cruiser escaping a deadly battle with the Covenant Onslaught and performing the Cole Protocol jumps into the middle of the Cyrannus Sector. But will the Covenant onslaught destroy the Colonials and the UNSC before they destroy each other? (CANCELLED, FOCUSING ON HALO THE IMPERIAL WAR)
Crossover - Halo & Battlestar Galactica: 2003 - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 93,820 - Reviews: 457 - Favs: 541 - Follows: 523 - Updated: 2/21/2013 - Published: 6/24/2011 - Kurt-051, W. Adama
When There Was a Tomorrow by
General Rage reviews
Do you remember when there was a tommorow? Commander Wade Shepard does, but with a Reaper threat looming he's not sure there is one anymore. And he's about to discover that his universe may not be the only one where mankind faces extinction. M for B&V
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 25 - Words: 630,925 - Reviews: 637 - Favs: 1,149 - Follows: 841 - Updated: 7/31/2012 - Published: 4/13/2011 - SPARTAN-B312/Noble Six, Shepard - Complete