Mass Effect Crossovers
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Mass Effect demi humans by EclipsePheniox reviews
Long ago on earth demi-humans appeared on earth. Now expanding into the galaxy the other races have to deal with both humans and demi-humans. Mass effect story from beginning to end but with monster people to make it more interesting. Experimental, possible harem
Crossover - Mass Effect & Monster Girl Encyclopedia - Rated: M - English - Adventure/Sci-Fi - Chapters: 41 - Words: 142,197 - Reviews: 55 - Favs: 266 - Follows: 281 - Updated: 8/20 - Published: 8/2/2019
Spectre with a Spartan Sister by ZeBear reviews
In 2574, after the formation of the United Sentient Species Federation, they find more intelegent life. Having infiltrated the Normandy Project, they save John Shepard from dying after the Collectors attack at the end of Mass Effect 1. Neglecting to tell his friends. Now with and entire Federation of Species behind him, instead of Cerberus, how will John deal with it all?
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 5 - Words: 6,717 - Reviews: 10 - Favs: 38 - Follows: 67 - Updated: 8/20 - Published: 7/28 - [Shepard, Tali'Zorah] Garrus V.
Force Effect: A Knights of the Old Republic & Mass Effect Crossover by DayDream Jedi reviews
Published for the 10th Anniversary of KOTOR, this tale mixes two of Bioware's biggest hits and the results could be... explosive. Shepard and her crew thought that The Crucible would save them and destroy the Reapers. They were wrong. New rules. New enemies. New war.
Crossover - Star Wars & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 16,490 - Reviews: 9 - Favs: 37 - Follows: 63 - Updated: 8/19 - Published: 7/15/2013 - [Revan, Shepard] Bastila S., Tali'Zorah
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: 22 - Words: 333,584 - Reviews: 344 - Favs: 629 - Follows: 757 - Updated: 8/19 - Published: 12/28/2020 - OC, U. Wrex, Shepard, Councilor Tevos
The Traveler's Second Chance by Rossweisse reviews
The Traveler has a different response to the Darkness. A story where the Guardians never accept the Darkness. The Traveler gave them a second chance, what do they do with it? Destiny shows up in Mass Effect. OC's for Destiny MC and Ghosts, different take on Destiny Lore
Crossover - Mass Effect & Destiny - Rated: M - English - Adventure/Romance - Chapters: 5 - Words: 40,965 - Reviews: 12 - Favs: 43 - Follows: 65 - Updated: 8/16 - Published: 8/6
The Wayfarer by Umbral Choir reviews
In the twilight of the universe the Ihan-rii, a forgotten sect of protoss, face an uncertain future in a realm consumed by the hounds of the void and their dark master. Xiltar, the last member of the umbral choir will guide his people into a fate beyond the designs of the Xel'naga only to find that he traded one war of annihilation for another.
Crossover - StarCraft & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 51 - Words: 225,064 - Reviews: 52 - Favs: 126 - Follows: 150 - Updated: 8/14 - Published: 2/5
Mass Effect: The Gears of War by IX404 reviews
Marcus thought he was done fighting after the death of Queen Myrrah, and the activation of the Imulsion Countermeasure. When he goes to help Baird investigate an abandoned COG facility, he will soon discover that while he ended one fight, another one has just begun.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 40 - Words: 216,284 - Reviews: 330 - Favs: 318 - Follows: 336 - Updated: 8/14 - Published: 3/31/2022 - Marcus F., A. Cole, Garrus V., Shepard - Complete
Mortal Desperations by Solthrin reviews
Arcturus Magnus, Sagittarum of the Legio Custodes, has fought for years within the webway and the Impossible City. Upon taking a near-fatal wound, the Emperor Himself removes Arcturus from the front, sending him instead to bring forth reinforcements from the Mechanicum. When something goes wrong during the return, where does this Custodian find himself?
Crossover - Warhammer & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 30,413 - Reviews: 68 - Favs: 347 - Follows: 518 - Updated: 8/12 - Published: 1/17 - Adeptus Mechanicus, Tali'Zorah, Shepard
Ark effect Remake by EclipsePheniox reviews
After the attack on the Collector base failed, the Normandy SR-2 found themselves on Ark a planet roaming with primordial beasts. But as their Commander returns, things become more complex as they learn about Ark and the reason they are there and the purpose of the world.
Crossover - Mass Effect & ARK: Survival Evolved - Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 24,961 - Reviews: 7 - Favs: 55 - Follows: 69 - Updated: 8/12 - Published: 1/3 - Liara T'Soni, Miranda L., Shepard
Cursed by Hookshot25 reviews
Clayton Carmine has only known hate and carnage for so many years. But once he survives the war he hoped to die in, things get strange. When people need help he isn’t one to shy away, and while helping Baird he gets sent to a place in dire need of a man like him. A man that can’t be claimed by death as easily as his kin.
Crossover - Gears of War & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 56,822 - Reviews: 8 - Favs: 49 - Follows: 76 - Updated: 8/8 - Published: 4/10 - C. Carmine, Samantha B./Sam, Shepard, Tali'Zorah
Mass Effect 4 by Boobymitch reviews
Two years after the Reaper Invasion and the death of Commander Shepard, the Universe is living in peace until a new threat arrives not of this Universe! Now it is up to Dr. Liara T'Soni and a new hero to stop this threat known as the Infinite Empire.
Crossover - Mass Effect & Star Wars - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 9,620 - Reviews: 3 - Favs: 6 - Follows: 9 - Updated: 8/8 - Published: 4/2 - Liara T'Soni, OC, Garrus V., U. Wrex
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: 39 - Words: 829,112 - Reviews: 808 - Favs: 471 - Follows: 537 - Updated: 8/7 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
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: 9 - Words: 84,696 - Reviews: 386 - Favs: 1,091 - Follows: 1,506 - Updated: 8/7 - Published: 2/11 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
Stellar Effect Codex by Brandon Storm reviews
A Codex exploring the History and Lore of the Stellar Effect Universe
Crossover - Mass Effect & Stellaris - Rated: T - English - Sci-Fi - Chapters: 16 - Words: 34,645 - Reviews: 25 - Favs: 40 - Follows: 39 - Updated: 8/6 - Published: 8/7/2022
A Metal Guardian by JawsOnYou67 reviews
The Universal Century, only a few short years ago humanity nearly eradicated itself to the tune of a madman, now it spreads, free of most of its old hatred. Yet the galaxy won't let them rest. Terminal prepares the twin Queens as best it can. (Gundam x Mass Effect)
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi/Humor - Chapters: 21 - Words: 105,199 - Reviews: 130 - Favs: 350 - Follows: 436 - Updated: 8/4 - Published: 8/18/2020 - Amuro R., Char A., Tali'Zorah, Admiral Hackett
When magic decides one war isn't enough by Alykto reviews
Following Voldemort's return after the Triwizard Tournament, Dumbledore realized he couldn't possibly handle the incoming conflict on his own. He needed a general to prepare the war. His summoning ritual then dragged Commandant Shepard, Specter and N7 Alliance Marine fighting the Reapers to 12 Square Grimmault.
Crossover - Harry Potter & Mass Effect - Rated: T - English - Adventure/Hurt/Comfort - Chapters: 6 - Words: 10,620 - Reviews: 12 - Favs: 16 - Follows: 25 - Updated: 8/3 - Published: 6/29 - Harry P., Ron W., Hermione G., Shepard
Beyond: A Mass Effect and Halo Story by yaknsneeze reviews
AU. 7 months after the events on the Citadel, Commander Shepard and an old ally return to fight an old enemy. Their new mission however, just got a lot more complicated. Post Mass Effect 3, and set in the Halo universe during the book Shadows of Reach.
Crossover - Halo & Mass Effect - Rated: M - English - Chapters: 4 - Words: 11,739 - Reviews: 8 - Favs: 21 - Follows: 34 - Updated: 8/3 - Published: 6/27 - Master Chief/John-117, Shepard
No place like home by Sicht
They promised, 'The Future is with us' and, I wondered who 'us' really was. The average Ivan and Natasha were nowhere in sight for whatever plans the leaders of the Union had in mind. Still, I don't think it was all smoke and mirrors. Might need to see for myself, just to make sure.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 5,322 - Favs: 2 - Follows: 6 - Published: 8/2
Shadows and Dust by HistoricalHijinks reviews
Shattered, Reborn, Reforged, Remade. The gaze of the Pheonix Force, seeking purpose and understanding, falls upon the Reapers and their harvests. Disgusted by their perverted, farcical 'cycle', it decides to wipe their stain from the multiverse. Needing a perfect host, it waits tens of millennia until, as Hannah Shepard is miscarrying due to eezo radiation, it finds one in her womb
Crossover - X-Men & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 12,440 - Reviews: 21 - Favs: 148 - Follows: 199 - Updated: 8/2 - Published: 6/25 - Ashley W., Liara T'Soni, Shepard
Stacked Deck by A Tin Can reviews
The peoples of Earth have reclaimed their legacy from the ashes of the old world. With mutants and aliens in tow as it's citizens alongside the rest of humanity, they're bound to make waves. The rest of the galaxy is about to see what happens when the right people know how to stack a deck in their favor.
Crossover - Fallout & Mass Effect - Rated: M - English - Adventure - Chapters: 1 - Words: 4,660 - Reviews: 4 - Favs: 51 - Follows: 88 - Published: 8/1 - Lone Wanderer, Courier, OC, Sole Survivor
Effects of Man by Krotosin reviews
During the shitshow that Eden Prime was, Shepard finds a man buried near the beacon. With him, two AIs, one from Reach, the other from Typhon. With him at her side, Jane's mission is easier. If it wasn't for the fact he's a hyper-lethal killing machine. And a bit of a wierdo. Mostly Titanfall and Halo, with some (a lot) Deep Rock Galactic.
Crossover - Mass Effect & Titanfall - Rated: M - English - Sci-Fi - Chapters: 3 - Words: 26,322 - Reviews: 10 - Favs: 57 - Follows: 77 - Updated: 8/1 - Published: 6/10
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: M - English - Adventure/Sci-Fi - Chapters: 10 - Words: 143,827 - Reviews: 200 - Favs: 909 - Follows: 1,316 - Updated: 7/31 - Published: 11/9/2020 - SPARTAN-B312/Noble Six, Tali'Zorah, Miranda L., Shepard
Hunter x Hunter x Mass Effect challenge by kameriderking
A Chimera Ant’s AU Challenge
Crossover - Hunter X Hunter & Mass Effect - Rated: T - English - Sci-Fi/Supernatural - Chapters: 1 - Words: 64 - Favs: 1 - Follows: 1 - Published: 7/30
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.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 153,359 - Reviews: 1466 - Favs: 4,035 - Follows: 5,060 - Updated: 7/30 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Leviathan
Folded Effects by Mr. Thicc Montagne reviews
This is a very WIP, and very AU story. Space Engineers lacks lore, but instead I'll be utilizing lore from my own Space Engineers group. Gaia Cracking Industries will be the sole SE faction represented. And there will be 1 ship brought over. The Yggdrasil. A carrier ship. The SE ships will not simply overpower the ME ones. Summary to be updated once there's a proper story here.
Crossover - Mass Effect & Space Engineers - Rated: M - English - Sci-Fi/Adventure - Chapters: 2 - Words: 3,777 - Reviews: 15 - Favs: 33 - Follows: 43 - Updated: 7/29 - Published: 7/25 - Shepard, OC
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