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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: 25 - Words: 136,914 - Reviews: 144 - Favs: 296 - Follows: 443 - Updated: 4h - Published: 2/21/2022
The Long, Long Walk by This Is Sarcasm reviews
Having stopped the Hive incursion on Eden Prime at the expense of being stuck in Commander Shepard's reality, Crow is offered a place on the Normandy. With nowhere to go, he accepts, and finds himself at the front of the fight against the Collectors, while at the same time trying to learn how to trust the ship's residents. In the end, though... maybe he's not 'stuck' after all.
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Angst - Chapters: 34 - Words: 123,556 - Reviews: 255 - Favs: 386 - Follows: 533 - Updated: 8h - Published: 9/15/2021 - Joker, Shepard, Dr. Chakwas, Crow
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: 42 - Words: 144,197 - Reviews: 56 - Favs: 271 - Follows: 290 - Updated: 11/7 - Published: 8/2/2019
Asymmetry: A Tragedy in Ten Acts by Pseudomonus
Almost 200 years after the Reapers' destruction, Commander Benezia Shepard is given a top secret mission: To explore a strange new universe; to seek out new threats and new enemies; to boldly go where no Asari has gone before! And, at the height of the Dominion war, with the Federation facing defeat, Captain Forest encounters an impossible ship that may hold the key to victory.
Crossover - StarTrek: Deep Space Nine & Mass Effect - Rated: M - English - Sci-Fi/Drama - Chapters: 2 - Words: 11,827 - Favs: 7 - Follows: 6 - Published: 11/7
To Trails End(Adept) by This Is Sarcasm reviews
Things go differently-and more disastrously-for Crow when he's faced with a less forgiving Young Wolf after the hunt for the High Celebrant. Devastated by the truth, he follows a terrible dream through The Howling, and emerges in a reality where there are no Guardians... and an army of Hive threatening to pour through. What's a lone Hunter to do, aside from the obvious? OVERHAULED!
Crossover - Mass Effect & Destiny - Rated: T - English - Sci-Fi/Angst - Chapters: 1 - Words: 2,651 - Reviews: 1 - Favs: 5 - Follows: 8 - Published: 11/7 - Garrus V., Thane K., Shepard, Crow
To Sail Among the Stars by How-not-to-do-something reviews
The Universal Century promised a new Era, and brought conflict. But the stars shine on, awaiting those who seek a new start. Crossposted from Ao3.
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 12 - Words: 60,334 - Reviews: 28 - Favs: 85 - Follows: 107 - Updated: 11/6 - Published: 11/1/2022
Never Fade Away by Ideas-Guy reviews
Lives are cheap and money is everything. That's how the orphanage made its money - lending out children for human expirementation. L is an old man at the age of fifteen and he knows he doesn't have much time left. All that mattered was getting out, but he soon learns that the world is a lot bigger than Night City. And that the galaxy is a lot bigger than Earth.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Adventure/Drama - Chapters: 43 - Words: 200,639 - Reviews: 308 - Favs: 968 - Follows: 1,091 - Updated: 11/6 - Published: 10/31/2022 - Shepard, V
Fall of the Citadel by Richard Scepton reviews
A fleet without an ocean, a humanity scarred forever by war. An admiral without a fleet, and a galaxy on the brink of war. It is the link in between, that will decide our fate, and that of the galaxy as a whole. CW: PTSD, depression, hand-to-hand combat and bayonets. Recommend not for children
Crossover - Mass Effect & Kantai Collection - Rated: T - English - Romance/Sci-Fi - Chapters: 3 - Words: 30,935 - Reviews: 11 - Favs: 24 - Follows: 28 - Updated: 11/5 - Published: 10/26 - [Shepard, OC] Shigure, Fubuki
Kage of the Stars V2 by Warlock99 reviews
Saving people is hard as is being a hero, but saving the universe? Well, that's going to take an army that transcends and breaks the laws of the universe. And a Kage to lead them to victory. This is the story of that Kage; this is the story of Naruto Uzumaki the Kage who rules the stars and all the universe.
Crossover - Naruto & Mass Effect - Rated: M - English - Adventure - Chapters: 6 - Words: 14,248 - Reviews: 11 - Favs: 58 - Follows: 76 - Updated: 11/5 - Published: 9/30 - Naruto U., Sara Ryder
Galactic Conflicts: Tales of First Contact by TheDoctor1998 reviews
Humanity and its allies have stood strong after the Great War with the Covenant. Follow the Systems Alliance as it goes through a first contact nearly as disastrous as the one that lead to the Great War.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 4 - Words: 18,922 - Reviews: 62 - Favs: 173 - Follows: 237 - Updated: 11/5 - Published: 2/6
Descent of the Angels by IReadToLive99 reviews
From a war-torn galaxy to another at the edge of extinction. The Blood Angels, through mysterious providence, are here now. Absent of the guidance of the Primarch and the Emperor, duty and devotion will lead them on a path to safeguard humanity from the darkness that lurks amongst the stars.
Crossover - Warhammer & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 6 - Words: 11,849 - Reviews: 33 - Favs: 161 - Follows: 246 - Updated: 11/5 - Published: 5/25 - Space Marines, Shepard
Stellar Effect by Brandon Storm reviews
The Reapers trap was perfect in its design. Their execution refined over billions of years, their technology refined since the dawn of time itself. Right up until Someone Broke the Trap!
Crossover - Mass Effect & Stellaris - Rated: T - English - Adventure/Sci-Fi - Chapters: 66 - Words: 289,833 - Reviews: 257 - Favs: 379 - Follows: 496 - Updated: 11/5 - Published: 8/7/2022
Effect of a Titanfall by MidnightFenrir reviews
When you die, you expect things to happen, from the void to eternal happiness. But if given the choice to live again, wouldn't you take it? I did. Since then, it's been one crazy thing after the other, the latest of which was to end up in yet another universe. But what can you expect when the manifestations of Luck and Fate themselves tell you it's going to be an adventure? OC/SI.
Crossover - Mass Effect & Titanfall - Rated: M - English - Adventure/Sci-Fi - Chapters: 8 - Words: 62,206 - Reviews: 338 - Favs: 1,812 - Follows: 2,354 - Updated: 11/4 - Published: 12/17/2016 - Kasumi G., Shepard, OC, BT-7274
Saga of the Bridger-Year 7 by Ganel750 reviews
The war between the Empire and the Coalition is about to enter its bloodiest phase as 2227 will go down as the 'year of battles'. Meanwhile the Jedi Order keeps fighting a parallel war against the Sith and the Imperial Federation is entangled with an emerging power in the Milky Way.
Crossover - Star Wars & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 14 - Words: 92,078 - Reviews: 11 - Favs: 17 - Follows: 14 - Updated: 11/3 - Published: 7/28 - Admiral Ackbar, OC, Ezra B., Shepard
Outlaws of the Verse by Styx Leyline
Post Reaper Invasion, Centuries Later. A more benevolent Citadel Council rules 42 galaxies. Advancing technology & culture. Even Extending life (De-age/Spanking). But all is not well, Pirates infest the Verse. While Space Forces struggle against them. But a 3rd faction sides with neither Space Forces nor Pirates. The Outlaws. MULTI-XOVER: Halo, Star Trek, DBZ, Firefly, Dr Who, HP
Crossover - Mass Effect & Outlaw Star - Rated: T - English - Adventure/Family - Chapters: 24 - Words: 39,797 - Favs: 9 - Follows: 8 - Updated: 11/2 - Published: 10/21 - U. Grunt, Hilda, Gene S., OC
Mass Effect: Fear the Old Blood by thelordofdarkreunion reviews
Shepard died, choking in the darkness of space. But yet she awoke, finding herself within a strange Hunter's Dream. Meeting the mysterious Good Hunter and Plain Doll, there are many lessons to be learned from both her home galaxy and a strange world of luminous moons and terrible beasts. Yet through them both, one rule remains constant: Fear the Old Blood.
Crossover - Mass Effect & Bloodborne - Rated: T - English - Adventure/Supernatural - Chapters: 4 - Words: 22,572 - Reviews: 42 - Favs: 118 - Follows: 170 - Updated: 11/2 - Published: 10/12 - Shepard, The Hunter, Plain Doll
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: 12 - Words: 41,629 - Reviews: 97 - Favs: 406 - Follows: 609 - Updated: 11/1 - Published: 7/8/2022 - Rookie, Shepard
Petroleum Effect by PetroleumHead reviews
A dark alternative Mass Effect universe with a little bit of XCOM and a little bit of Cthulhu Mythos, along with some short-lived Care Bears. If humanity discovers that, in the right circumstances, petroleum can be used as a superior alternative to element zero, just how far will Earth's increasingly post-human, xenophobic, authoritarian government go to obtain oil?
Crossover - Care Bears & Mass Effect - Rated: M - English - Sci-Fi/Horror - Chapters: 13 - Words: 42,515 - Reviews: 23 - Favs: 31 - Follows: 33 - Updated: 11/1 - Published: 9/16
New Era II by martinantab reviews
The war has ended and UNSC/UEG can finally start with rebuilding. Former Covenant races created new alliance to prevent another big war. Everybody thought that they can live peacefully, but few years later UNSC Gargantua has discovered mysterious object in the Orion's arm and no one is sure, if everything will be the same again.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 2 - Words: 8,078 - Reviews: 13 - Favs: 57 - Follows: 86 - Updated: 11/1 - Published: 10/28 - Master Chief/John-117, T. Lasky, Councilor Tevos, Councilor Valern
Robo Effect by Star Sage reviews
The Robotech wars are over. The survivors of Humanity and the Zentraedi are now alone in the universe, and so, come together, becoming something new, becoming Terrans. Now this race will find itself thrust into the galactic scene, as the Citadel Races and those beyond test these young upstarts, and in the shadows, old things begin to move.
Crossover - Robotech/Macross & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 61 - Words: 221,329 - Reviews: 627 - Favs: 884 - Follows: 950 - Updated: 11/1 - Published: 4/14/2015
Effecting Fate by shdowstep reviews
Shiro Emiya: Engineer, Colonist, and Survivor. Arturia Pendragon: Vanguard, Spacer, and War Hero. "It has been said that the Once and Future King would return when she was most needed. With the threat as large as the Reapers? Well, that would certainly qualify as such a time. And who better to accompany a sword than it's sheath?"
Crossover - Fate/stay night & Mass Effect - Rated: T - English - Romance/Adventure - Chapters: 8 - Words: 87,711 - Reviews: 371 - Favs: 1,482 - Follows: 2,048 - Updated: 10/31 - Published: 12/13/2019 - [Arturia Pendragon, Shirō E.]
Feared Reverence by ayab reviews
376 years after the battle between heaven and earth. Two humans have achieved godhood. Using their power to guide humanity to the stars. How will the galaxy react to see a species so advanced yet so primitive? So powerful yet not wanting to use their power. They are what the citadel race aspires to be and hates because of their jealousy.
Crossover - Naruto & Mass Effect - Rated: T - English - Fantasy/Sci-Fi - Chapters: 25 - Words: 86,410 - Reviews: 180 - Favs: 301 - Follows: 417 - Updated: 10/31 - Published: 1/14
Not in one's own plate by Sicht reviews
Time has become an elusive concept, leaving V uncertain if she has been trapped for a year or even longer. Amidst lingering anxiety and worries, she clings to the belief that her sacrifices were not in vain, desperately seeking a glimmer of hope for a meaningful outcome to her plight. Since hope dies last.
Crossover - Mass Effect & Cyberpunk 2077 - Rated: M - English - Adventure/Sci-Fi - Chapters: 11 - Words: 52,944 - Reviews: 15 - Favs: 76 - Follows: 133 - Updated: 10/31 - Published: 9/8/2022 - V, OC
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: 2 - Words: 11,080 - Favs: 2 - Follows: 6 - Updated: 10/31 - Published: 8/2
Mobile Suit - Mass Effect: The First Contact War by Mister Smallville reviews
Two worlds collide, neither prepared for the other. The Solar Sphere Congress -successor to the long gone Earth Federation- unwittingly starts a galactic crisis when it makes first contact with a very angry, very trigger happy Turian Hierarchy.
Crossover - Gundam UC & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 9 - Words: 56,025 - Reviews: 117 - Favs: 210 - Follows: 328 - Updated: 10/31 - Published: 8/7
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