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Alternate First Contact War
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Focus: Games Mass Effect, Since: 01-19-11
Founder: Relvain Jenafuse - Stories: 513 - Followers: 445 - Staff: 17 - id: 88942
This community is for stories with the First Contact War in it, the war can be against the System Alliance or an alternate Human Civilization. This community will accept any story and All Ratings are accepted. Even if the story has only one long chapter with the First Contact War in it then it is acceptable for this community.

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Please Note: I don't actively search through the database for any stories, so send me a link if you find any, or I will just upload the newly published

Transcendent Humanity by Solaris242 reviews
Humanity never developed FTL. The Prothean archives contained no technology, no Element Zero, just a warning. Isolated from the rest of the galaxy for two thousand years, restricted to their only system, how will humanity have changed when they first meet the Turians? AU, alternate history of humanity and First Contact.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 18 - Words: 40,604 - Reviews: 2050 - Favs: 6,127 - Follows: 7,124 - Updated: 3/1/2016 - Published: 5/7/2013
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: 3332 - Favs: 4,814 - Follows: 5,660 - Updated: 5/22/2016 - Published: 10/13/2011 - Tali'Zorah
Mass Effect: The First War by ProfFartBurger reviews
The Prothean Ruins weren't. They contained little more than mentionings of an Alien Society; as a result, humanity develops on a completely different path than what was intended, and when first contact is made not with the Turians, but a desperate, destitute race viewed as beggars and thieves, how will this dying race change Humanity? And how will Humanity change the Galaxy? *A/U!*
Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 22 - Words: 200,906 - Reviews: 1821 - Favs: 3,344 - Follows: 2,445 - Updated: 1/12/2014 - Published: 1/26/2013 - OC - Complete
Biomass Effect by Beastrider9 reviews
All life on Earth had been consumed by Blacklight. With no Biomass to feed on, Blacklight had to evolve, adapt, and grow. Now a collective Council of Aliens discovers the existence of such a life form. How do the aliens see a form of life that is viral, how they deal with it, what are the consequences to the galaxy of such a race existing at all.
Crossover - Mass Effect & Prototype - Rated: M - English - Sci-Fi - Chapters: 58 - Words: 296,004 - Reviews: 2510 - Favs: 3,315 - Follows: 3,702 - Updated: 8/1 - Published: 8/8/2014
Psi Effect by Cap'n Chryssalid reviews
A fun-loving asari mercenary finds herself a little in over her head when she ends up abducted by terrifying aliens from beyond the galactic frontier. These asari-like creatures call themselves 'humans.' They seem to be secretly nosing about on the borders of known space, acting through proxies, conducting covert operations, and they've got a deal for an enterprising asari...
Crossover - X-Com & Mass Effect - Rated: T - English - Humor/Sci-Fi - Chapters: 43 - Words: 387,570 - Reviews: 1342 - Favs: 3,138 - Follows: 3,680 - Updated: 1/2 - Published: 7/19/2014 - U. Wrex, Daro'Xen, Shepard (F), OC
And the Meek Shall Inherit the Galaxy by Full-Paragon reviews
Due to a shift in turian and quarian patrols, first contact for humanity is friendly; Rael'Zorah and Hannah Shepard become friends, as do their species. But the galaxy is not a safe place, and schisms develop when the Council steps in. As humanity finds new allies among the stars, something darker stirs. The Meek must beware, for it is nearly harvest time. AU, lots of worldbuilding
Mass Effect - Rated: T - English - Sci-Fi/Family - Chapters: 49 - Words: 232,286 - Reviews: 3712 - Favs: 3,128 - Follows: 2,363 - Updated: 11/16/2013 - Published: 3/31/2013 - Tali'Zorah, Shepard (M), Hannah S., Rael'Zorah - Complete
First Contact by Animus of Masada reviews
An asari exploration vessel discovers Earth in the 2030's...and the first contact scenario has incredible implications for both species. What does humanity look like through alien eyes? Where do they go from here? /-AU: no Reapers, completely disconnected from the plot of the games, but mostly faithful to the setting. Told from many points of view.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 16 - Words: 51,333 - Reviews: 1323 - Favs: 2,757 - Follows: 2,793 - Updated: 4/10/2013 - Published: 8/12/2011
Mythos Effect by Omniscent1 reviews
A crossover between Mass Effect and Cthulhutech. Humanity has won the Aeon War and has since expanded and thrived. How will the galaxy fare with this new power?
Crossover - Cthulhu Mythos & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 17 - Words: 111,475 - Reviews: 938 - Favs: 2,674 - Follows: 2,967 - Updated: 5/14 - Published: 6/5/2013 - Shepard (M)
From the Ashes by erttheking reviews
Even after seeing their world burned, Humanity was able to stand up again, and push beyond their pre-war status and reach the heavens. But how will a hardened Humanity handle life among the stars? And how will others react to this aggressive newcomer?
Crossover - Fallout & Mass Effect - Rated: T - English - Sci-Fi/Romance - Chapters: 116 - Words: 889,553 - Reviews: 3404 - Favs: 2,415 - Follows: 2,259 - Updated: 4/1 - Published: 5/17/2012
Lost Magic: First Contact by MightyFish reviews
A man is left trapped in time, while his world dies around him. Now awakened in the distant future, he leaves the planet of his birth and embarks on a journey to find that which was lost. But the new frontier holds many dangers, and the human race is about to face its first great challenge. A HP/ME crossover. Slow pace, rated M for safety, my profile has more details.
Crossover - Harry Potter & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 10 - Words: 162,448 - Reviews: 678 - Favs: 2,274 - Follows: 2,862 - Updated: 7/25/2015 - Published: 2/4/2015 - Harry P.
To Break Thy Chains and Cycles by WiseSilver reviews
Thought dead, Harry Potter reappears out of the Veil of Death, aged and far more powerful then before. After defeating Voldemort, Harry turns to his training under the Sith Lord Revan to conquer the Earth and spread humanity out into the stars. However he discovers that Humanity is not alone in the Galaxy and that an even darker evil than any Sith exsits. Harry x Fleur/ Grey Harry
Crossover - Harry Potter & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 8 - Words: 44,327 - Reviews: 560 - Favs: 2,238 - Follows: 2,748 - Updated: 3/20 - Published: 6/14/2013 - [Harry P., Fleur D.]
XCOM: Second Contact by Agayek reviews
With the destruction of the Temple Ship humanity knew peace. XCOM never forgot their motto however, 'always vigilant, always reliable'
Crossover - X-Com & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 26 - Words: 294,105 - Reviews: 1059 - Favs: 2,152 - Follows: 2,227 - Updated: 9/15/2013 - Published: 1/1/2013
Mass Effect: The New Journey by Arashi the Solar Phoenix reviews
During a Joint Deployment, the UNSC Infinity and Her Sangheili allies are suddenly thrown into a new Galaxy, and end up near Charon before the Systems Alliance discovers the Charon Relay. Alliances are forged and how will the galaxy react to an aggressive humanity that not only doesn't use Mass Effect technology, but will not let anyone stand in their way of expansion? AU PreME1
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 19 - Words: 190,515 - Reviews: 1285 - Favs: 2,088 - Follows: 2,569 - Updated: 12/31/2016 - Published: 1/26/2014
Mass Effect: Synthesis by Jade Tatsu reviews
"To the Sol Alliance and all of Humanity, greetings. I am Harbinger and I have traveled across the galaxy to meet you." Shepard wasn't the first to reach the Catalyst, eons ago, someone else did and they chose synthesis, embedding the desire in the Reapers. They've searched for organics to merge with ever since and now they've found them. AU, First Contact, Humans / Reapers
Mass Effect - Rated: T - English - Adventure/Drama - Chapters: 39 - Words: 204,088 - Reviews: 1638 - Favs: 2,039 - Follows: 1,499 - Updated: 4/18/2015 - Published: 11/5/2014 - Shepard (F), Harbinger, Garrus V., Saren A. - Complete
Mass Effect: End of Days by Postmeat reviews
An ancient danger threatens the galaxy, unknown to all. A humanity which never discovered Prothean ruins, expanding through space on their own, emerges. Joined with the machines they created, hardened by war with a terrifying enemy, they read the writing on the wall. But will the galactic community already there listen to these newcomers, stirring up trouble everywhere they go?
Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 18 - Words: 198,370 - Reviews: 572 - Favs: 1,971 - Follows: 2,513 - Updated: 10/26/2017 - Published: 3/8/2015 - Admiral Hackett, Shadow Broker, Shepard (M), Rachni Queen
Mass Effect: Prometheus by NeonZangetsu reviews
Subject Zero wasn't the only criminal caged in Purgatory. Hundreds of thousands once called that cold abyss home. But there are some things that should never be unleashed, forces best left untapped. Now, a new terror has been released into the galaxy. But is he a friend or foe? Either way, it'll be one hell of a ride on the way down. Narutoxharem. Mass Effect 2.
Crossover - Naruto & Mass Effect - Rated: M - English - Romance/Adventure - Chapters: 10 - Words: 54,570 - Reviews: 562 - Favs: 1,942 - Follows: 2,303 - Updated: 11/10/2017 - Published: 7/10/2014 - Naruto U., Jack, Samara, Clone Shepard (F)
The Harbinger Of Change by Vader's.Apprentice.I.Am reviews
The Reapers left mass effect technology for the species to find so that the cycle would continue. However, what if a species was clever enough to avoid the trap. A magical and technologically advanced Humanity makes contact with the galaxy and prepares to break the cycle.
Crossover - Harry Potter & Mass Effect - Rated: T - English - Adventure - Chapters: 10 - Words: 25,302 - Reviews: 833 - Favs: 1,891 - Follows: 2,335 - Updated: 1/28/2014 - Published: 10/5/2013 - Harry P., Shepard (M)
Cycles Upon Cycles by The Incredible Muffin reviews
The residents of the Koprulu Sector thought they had finally achieved peace. They were wrong. Now, the Koprulu Alliance is faced with a galaxy that was bigger than they thought. They will meet new friends, and more importantly, new enemies, but all will be forced to put away their hatreds, both old and new, or none will survive the darkness that is to come...
Crossover - StarCraft & Mass Effect - Rated: T - English - Sci-Fi/Supernatural - Chapters: 35 - Words: 347,305 - Reviews: 1259 - Favs: 1,847 - Follows: 2,089 - Updated: 7/31 - Published: 1/13/2015
A Dark Dawn by Ave Imperium reviews
A new race was discovered and annihilated. A century passed and Citadel space forgot, but Humanity never did.
Mass Effect - Rated: T - English - Horror/Adventure - Chapters: 36 - Words: 143,972 - Reviews: 989 - Favs: 1,827 - Follows: 1,908 - Updated: 4/12/2016 - Published: 8/21/2014 - Tali'Zorah, Shepard (M) - Complete
Terran Ingenuity by Xeno Major reviews
The Great Wars are over. Jim Raynor and his men have left the Koprulu Sector behind, choosing to settle a world away from that sector of space. Unfortunately, the colony of Shanxi is not safe; hostile aliens have invaded, intent on controlling the Terrans and their bizarre technology. Unfortunately for the Turians, the Terrans have experience fighting hostile alien invaders.
Crossover - StarCraft & Mass Effect - Rated: T - English - Chapters: 7 - Words: 90,510 - Reviews: 529 - Favs: 1,780 - Follows: 1,984 - Updated: 7/1/2014 - Published: 3/24/2013
The Dragon Queens by Mystborn reviews
Prophesies complete, an immortal Dragonborn and her vampire best friend are left to their own devices. The result? A jointly ruled empire of Nirn that spans the stars. So when Batarians are chased through relay 314 by the Turians into Imperial space, all oblivion breaks loose. How will the Galaxy of Science hold up to the Empire of Magic, Especially one ruled by the Dragon Queens?
Crossover - Elder Scroll series & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 25 - Words: 117,829 - Reviews: 579 - Favs: 1,737 - Follows: 2,161 - Updated: 1/12 - Published: 2/28/2015 - Dragonborn/Dovahkiin, Serana, Shepard (F)
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: 18 - Words: 204,070 - Reviews: 1144 - Favs: 1,697 - Follows: 2,279 - Updated: 8/31 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Shepard (F), Garrus V.
History Repeated, Lesson Learned by KitBeast reviews
The Prothean empire left a great many Beacons behind after there fall, there purpose, to warn the younger races of the dangers of the Reapers. Unfortunately no one could understand them. What would happen if someone could.
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi - Chapters: 18 - Words: 51,084 - Reviews: 1075 - Favs: 1,695 - Follows: 1,966 - Updated: 12/10/2013 - Published: 2/20/2013
Mass Effect: The New Face of War by ProfFartBurger reviews
It is said that War never Changes; Men do, through the roads they walk, but War does not. The Humans fought The First War, and alongside the Quarians, the Alliance stands tall against the Galaxy in the face of continued adversity. Now Humanity's place is challenged, their power tested, and age-old beliefs are shattered when a beyond-ancient species is forced onto the playing field.
Mass Effect - Rated: T - English - Sci-Fi/Suspense - Chapters: 61 - Words: 535,872 - Reviews: 1280 - Favs: 1,625 - Follows: 1,688 - Updated: 6/11/2017 - Published: 1/26/2014 - Shepard (M), OC - Complete
Mass Effect: A new past by Bombsquad reviews
A different history to Mass Effect in which Human technology develops along different lines than anything the Citadel knows...an Alternative History of Mass Effect.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 137,294 - Reviews: 671 - Favs: 1,550 - Follows: 880 - Updated: 5/18/2011 - Published: 12/11/2010 - Complete
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