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Sparatus' Folly by Carthienes reviews
A series of snippets telling the story of the Human-Citadel war, fought between the Human X-Com and the Turian Hierarchy. Originally published on Reddit. Based on the original X-Com UFO Defence (1994), not the Reboot!
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 14 - Words: 21,693 - Reviews: 39 - Favs: 106 - Follows: 167 - Updated: 4h - Published: 2/14 - Complete
Wasteland Galaxy by Redentor reviews
Matriarch Lantaya is a brave explorer from the Golden Age of Asari space exploration, and she wants to go home. The Lone Wanderer is a messianic cyborg from a world scorched in nuclear fire, and he wants to save the wastelands. Courier Six is a tribal postman who usurped control of an entire city state. He wants to eat people. Among other things. (Also available on Spacebattles)
Crossover - Fallout & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 12 - Words: 86,218 - Reviews: 12 - Favs: 73 - Follows: 111 - Updated: 5h - Published: 1/5 - Lone Wanderer, Courier, OC
Mass effect: the Jaded ones by Ray SK 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)
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 2 - Words: 8,237 - Reviews: 18 - Favs: 43 - Follows: 64 - Updated: 15h - Published: 2/6 - E. Buck, OC
Rising from the Embers of Sera by thehappy reviews
The people of Sera rebuild, spreading to the stars. Wars will be waged. Peace will be sought. The Coalition has risen from the ashes to take their right to exist in the galaxy. They will survive...no matter the cost.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 9 - Words: 139,987 - Reviews: 138 - Favs: 335 - Follows: 411 - Updated: 16h - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
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.
Crossover - Halo & Mass Effect - Rated: T - English - Romance/Adventure - Chapters: 3 - Words: 4,777 - Reviews: 6 - Favs: 57 - Follows: 85 - Updated: 18h - Published: 11/11/2021 - [OC, Vetra N.] T. Hood
Saga of the Bridgers-Year 5 by Ganel750 reviews
The Death Star has been destroyed. While the Coalition celebrates, Ezra and Jaral return to Lothal, to spend some time with their family and introduce Luke to the ways of the Jedi. But the Empire is far from broken, as Grand Admiral Tanis and his fleet are already preparing to avenge the death of so many of their comrades.
Crossover - Mass Effect & Star Wars Rebels - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 5 - Words: 24,086 - Reviews: 1 - Favs: 7 - Follows: 9 - Updated: 22h - Published: 2/2 - [Ezra B., Sabine W.] Stromtroopers, OC
The Canadian Commonwealth by Vassago1991 reviews
In the vast multiverse event can happen that should never happen this is the story of one such universe with an event that should have never happened.
Crossover - Halo & Mass Effect - Rated: M - English - Chapters: 1 - Words: 3,336 - Reviews: 3 - Favs: 7 - Follows: 11 - Published: 2/24
Mass Effect: The Hammer of War by IX404 reviews
When fighting against Tyranids on a far flung Civilized World, Primaris Space Marine Marcus Tyrellus expects it to be like every other day in the Imperium of Man. Little does he know is that, he, and a few others, will soon be working to save another universe from destruction at the hands of an ancient foe.
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 9 - Words: 43,139 - Reviews: 70 - Favs: 123 - Follows: 165 - Updated: 2/24 - Published: 1/27 - Imperial Guard, Space Marines, OC, Shepard
Were it So Easy by Sigma0327 reviews
Six's life was a giant war. Every battle was a test of sheer tenacity and stubbornness against insurmountable odds. Every moment, every bullet fired, every Covenant, Insurrectionist, and Flood spore killed has led up to his last fight. Once again he was one of the few that stood between Earth and her enemies. This would be his final battle, and nothing could change that, right?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 45,863 - Reviews: 70 - Favs: 418 - Follows: 620 - Updated: 2/23 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
The Long, Long Walk by This Is Sarcasm reviews
Crow is stuck, but it's not all bad news; he's been offered shelter on the Normandy, and Spider can't hurt them here. Shepard now has an unkillable paracausal warrior, and his 'not-an-AI', Glint, is a complete cinnamon roll, but it's not all good news; he's half-starved, in culture shock, and has a bad case of trust issues. He might need work, sure, but who on this ship doesn't?
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Angst - Chapters: 11 - Words: 30,920 - Reviews: 57 - Favs: 157 - Follows: 231 - Updated: 2/23 - Published: 9/15/2021 - Joker, Shepard, Dr. Chakwas, Crow
BattleTech: The Mass Effect by IX404 reviews
During the beginning of the Reaper War, Shepard is informed of a Prothean artifact claimed by Cerberus and sent to stop them. Little does he know is that soon, he will find himself and his crew in a world both familiar and alien to their own.
Crossover - Mechwarrior/Battletech & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 125,460 - Reviews: 178 - Favs: 142 - Follows: 173 - Updated: 2/23 - Published: 12/21/2020 - Garrus V., Shepard, James V., Nyreen K.
Eat Me by Ultimatedaywriter reviews
Harry is transmigrated into by a cultivator with a simple mission. Get humanity up in the air before the galactic war of antihalation kicks off. Unfortunately, everything he tries goes horribly wrong. Brain eating phoenixes, timelord Tom Riddles, and indoctrinated vampires block him at every turn. He knows the only way to win is the get away and let the monsters eat each other.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Parody/Horror - Chapters: 19 - Words: 22,561 - Reviews: 37 - Favs: 38 - Follows: 70 - Updated: 2/23 - Published: 2/5
The Claw of the Raven by Lighting wolf knight reviews
A plot to throw the galaxy into chaos and only those outside the rules were a match for it. Rated T for violence, death, and profanity.
Crossover - Warhammer & Mass Effect - Rated: T - English - Romance/Supernatural - Chapters: 1 - Words: 803 - Reviews: 2 - Favs: 1 - Follows: 3 - Published: 2/22 - [OC, Daro'Xen] Cyrus, Illusive Man
System Alliance: War for Milda by Konradoziom reviews
The remnants of Dark Empire began their siege on the planet Milda. The first real test for the navy and army of the System Alliance. Will they be up to the task or will they fail? And the most important. What will the price of this War be?(Sequel to - System Alliance Rise to Power)
Crossover - Star Wars & Mass Effect - Rated: T - English - Chapters: 6 - Words: 14,864 - Reviews: 10 - Favs: 52 - Follows: 51 - Updated: 2/22 - Published: 1/11 - Complete
Dead On Arrival: ML Short Story by TacoWrath
When the crew of the UCV Prosecutor, a Confederation destroyer, come across a floating alien derelict with a strange connection to humanity, they find something onboard that thrusts them into a fight for their lives. Based on Mass Effect: Murphy's Law, recommend you read it first for lore, technical details.
Crossover - Mass Effect & Dead Space - Rated: M - English - Sci-Fi/Horror - Chapters: 2 - Words: 12,054 - Favs: 7 - Follows: 14 - Updated: 2/21 - Published: 2/16
The Way Forward by BigGsmallp reviews
Lost and adrift in the greatest of all seas, Kuzan attempts to find himself in their new life, and hopefully find redemption
Crossover - One Piece & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 4 - Words: 11,825 - Reviews: 6 - Favs: 21 - Follows: 29 - Updated: 2/21 - Published: 2/5 - Aokiji/Kuzan, Shepard
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: 2 - Words: 3,580 - Reviews: 3 - Favs: 13 - Follows: 19 - Published: 2/21
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 26 - Words: 287,962 - Reviews: 1925 - Favs: 3,393 - Follows: 4,326 - Updated: 2/21 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Garrus V., Shepard
Return of the Krogan by JManM reviews
Jack and Grunt have achieved godhood and become the masters of a universe. Now Grunt has unlocked the multiverse by harnessing the powers of his phallus and laid bare new possibilities for endless adventure. Very slow updates as I am focusing on other stories.
Crossover - X-overs & Mass Effect - Rated: M - English - Humor/Adventure - Chapters: 1 - Words: 677 - Reviews: 3 - Favs: 47 - Follows: 65 - Published: 2/21 - Jack, U. Grunt
Mass Effect SI: Ultimate Krogan by JManM reviews
This is my SI fic as Grunt that I have been posting on Webnovel. Story contains: coarse language, violence, and suggestive adult themes. By popular demand of my Webnovel audience this story has continued beyond Mass Effect into various crossovers currently including Star Wars, Skyrim, Gears of War, and will continue into Brutal Legend, Halo, X-men Evolution, and more to come.
Crossover - X-overs & Mass Effect - Rated: M - English - Romance/Adventure - Chapters: 117 - Words: 182,878 - Reviews: 98 - Favs: 291 - Follows: 305 - Updated: 2/21 - Published: 10/21/2021 - Jack, U. Grunt - Complete
Path of Blood by Soundwave and Cheshire reviews
When She woke up, She had no name and memories. Just a dream and a contract
Crossover - Mass Effect & Bloodborne - Rated: M - English - Adventure/Supernatural - Chapters: 2 - Words: 7,852 - Reviews: 3 - Favs: 12 - Follows: 16 - Updated: 2/20 - Published: 9/26/2021
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.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 23 - Words: 79,389 - Reviews: 297 - Favs: 635 - Follows: 814 - Updated: 2/20 - Published: 9/18/2016 - Master Chief/John-117, Cortana, J. Garson, Tali'Zorah
Commanding Effect by vmoneywashere reviews
Based on the Command and Conquers general game. The Systems Alliance never materialized. Instead, a collection of advanced nation-states takes its place. How will the Citadel react when they meet a race so different from them in terms of technology and structure? Not well since they just allied themselves with the Quarians. P.S, I don't own Command and Conquer or Bioware.
Crossover - Command & Conquer & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 42,424 - Reviews: 70 - Favs: 330 - Follows: 418 - Updated: 2/20 - Published: 8/13/2021 - [Tali'Zorah, Shepard] OC, Rael'Zorah
We Decide Our Own Future by Merriest Wood reviews
Xavier Holmes, a simple programmer and over all shut-in was killed during a bank robbery. however, instead of staying dead he was reborn as an A.I and transported to the Star Trek universe. Xavier didn't how it was possible but one thing was clear he'd decide his own future. I do not own anything of Mass Effect or Star Trek.
Crossover - StarTrek: The Original Series & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 3 - Words: 9,903 - Reviews: 28 - Favs: 90 - Follows: 127 - Updated: 2/19 - Published: 2/12 - OC
Technophiles by thelordofdarkreunion reviews
Everyone's favorite technophilic groups meet: the Adeptus Mechanicus from Warhammer 40k and the Quarians from Mass Effect. When the Cult Mechanicus learns of the existence of the A.I.'s known as the Geth and Reapers, they decide only one thing can be done, and enlist the help of Quarians to fight once more for their ancestral home. Keelah se'lai and Glory to the Machine God!
Crossover - Warhammer & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 13 - Words: 139,370 - Reviews: 266 - Favs: 446 - Follows: 632 - Updated: 2/19 - Published: 9/24/2021 - Adeptus Mechanicus, Tali'Zorah, Kal'Reegar, Rael'Zorah
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