Halo and Mass Effect Crossovers
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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.
Rated: T - English - Romance/Adventure - Chapters: 2 - Words: 1,964 - Reviews: 5 - Favs: 49 - Follows: 78 - Updated: 12/2/2021 - Published: 11/11/2021 - [OC, Vetra N.] T. Hood
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.
Rated: M - English - Sci-Fi/Adventure - Chapters: 15 - Words: 73,932 - Reviews: 714 - Favs: 2,391 - Follows: 3,202 - Updated: 11/27/2021 - Published: 7/14/2017 - Master Chief/John-117, J. Keyes, Miranda L., Shepard
Mass Emile by Ranschaj reviews
Emile survives the two zealots at the end of Reach, and after surviving Covenant onslaught, finds himself in the ME universe. Kick-ass picture is thanks to freejimmy on deviantart
Rated: M - English - Adventure/Sci-Fi - Chapters: 8 - Words: 59,888 - Reviews: 816 - Favs: 923 - Follows: 1,081 - Updated: 11/26/2021 - Published: 12/11/2012 - Emile-A239/Noble Four
Star League of the Orion Arm Codex by Reichenfaust reviews
Megaverse. A grand vision, on how Mass Effect, and others will be affected by a humanity forged from the influences of 1980's-2000's Sci-Fi and such. How will the Citadel deal with a humanity that has seen and has Cyborgs, Super-Soldiers, BattleMech's, WarShips, with more to come? Will contain dossiers on factions, weapons, characters, and such as we go.
Rated: T - English - Sci-Fi/Fantasy - Chapters: 3 - Words: 73,229 - Reviews: 40 - Favs: 145 - Follows: 158 - Updated: 11/26/2021 - Published: 12/25/2016
A Whole New World by Spartan III Commando reviews
Noble six's story did not end on Reach, he escaped the doomed planet after saving the Pillar of Autumn, and he and 117 fought across each Halo, until an incident sent him to a whole new world. And he is wholly unprepared for the journey in store.
Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 23,430 - Reviews: 38 - Favs: 200 - Follows: 295 - Updated: 11/18/2021 - Published: 7/7/2016 - SPARTAN-B312/Noble Six
Heroes UNITE! by So-Pro Warrior reviews
Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!
Rated: T - English - Adventure/Sci-Fi - Chapters: 47 - Words: 1,478,254 - Reviews: 855 - Favs: 369 - Follows: 368 - Updated: 11/15/2021 - Published: 6/21/2013 - Master Chief/John-117, Shepard
Catalog of War by hunter 139 reviews
A collection of one shots about events, including battles, conflicts and skrimishes, that occur in the shared multiverse of my stories. I do not own any of the franchises that appear in this series. Multicrossover.
Rated: T - English - Sci-Fi - Chapters: 28 - Words: 67,362 - Reviews: 25 - Favs: 37 - Follows: 35 - Updated: 11/13/2021 - Published: 4/21/2015
Operation Phoenix & Raven by Ordo Warrior reviews
Continuing from Best of Spartans and Spectres. Commander Shepard has been captured and Noble Six turns to the one group that can help save her, but will that help come at too great of a cost?
Rated: M - English - Chapters: 53 - Words: 175,250 - Reviews: 91 - Favs: 182 - Follows: 235 - Updated: 11/12/2021 - Published: 10/21/2014 - SPARTAN-B312/Noble Six, J. Garson - Complete
Daily war with monster girls by Masterdude21 reviews
With the help of the highly-motivated extra-species in the military, mankind holds their own against the brutal onslaught of the Covenant. In their haste to close the gap in space warfare, ONI stumbles upon Relay 314. Even as new enemies arise, the galaxy constantly thwarts Cortana's schemes to build the Master Chief the ultimate harem. Halo/Mass Effect/Monster Musume crossover.
Rated: M - English - Humor/Romance - Chapters: 26 - Words: 351,644 - Reviews: 1019 - Favs: 1,899 - Follows: 2,181 - Updated: 11/9/2021 - Published: 9/20/2016 - Master Chief/John-117, Cortana, Shepard
Salvation (ENG) by Z0n3theDaMn3d reviews
The knowledge of sin is the beginning of salvation. More than 40 years after the end of the war against the Covenant, a new storm is brewing on the edge of the human empire. Will the colonies of the Linwood Sector be able to withstand this new threat or will they burn like Harvest once did?
Rated: M - English - Sci-Fi/Adventure - Chapters: 5 - Words: 40,517 - Reviews: 44 - Favs: 200 - Follows: 312 - Updated: 10/31/2021 - Published: 10/8/2020 - T. Hood, Shepard, Councilor Tevos, Benezia
For Earth and All Her Colonies by GADPELLAEON reviews
Post Human-Covenant War AU. After the Great War, all the UNSC wants to do is rebuild and live in the peace. A peace that so many died for. What happens when they learn that no matter what, war will always find them. Chapters Updated - Chapter 11 uploaded (07/08/2019) Any criticism and/or tips welcome.
Rated: T - English - Sci-Fi - Chapters: 13 - Words: 80,854 - Reviews: 502 - Favs: 1,489 - Follows: 2,091 - Updated: 10/14/2021 - Published: 12/27/2018 - Master Chief/John-117, Arbiter, J. Garson, Councilor Tevos
Faction Death Battle by Konradoziom reviews
Death Battle, but between factions. Factions may not necessarily come from the HALO or MassEffect universes. You can ask fort factions you want to fight with each other in the comments. I found something like that on YouTube and decided to do it myself, on fanfiction, although on YouTube it was called otherwise, 'Faction Compare', I think.
Rated: K+ - English - Fantasy/Sci-Fi - Chapters: 3 - Words: 5,100 - Reviews: 14 - Favs: 14 - Follows: 10 - Updated: 10/13/2021 - Published: 4/19/2021
The Adventures of the Lucen: The VykurCorp Conspiracy by General Rage reviews
Liara T'Soni continued her mission to protect the Galaxy while Commander Shepard is in another dimension. She must stop the Covenant and the allies they've gathered from wreaking havoc in a Galaxy without it's greatest hero. While she's had some success, there's a gathering storm on the horizon and one of her crew of misfits will be forced to confront her past before it clears.
Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 214,973 - Reviews: 155 - Favs: 121 - Follows: 125 - Updated: 10/8/2021 - Published: 6/26/2016 - OC, Liara T'Soni, U. Wrex
Mass Effect: Wayward Souls (rewrite pending) by ChroniclerofChaos07 reviews
No one knew what would really happen when the slipspace bomb detonates. All they know is that whatever gets caught in it would be sent to "oblivion". No one expected what would happen when you mess with the 11 dimensions of splipspace. Now Noble Six faces a new galaxy along side two other "Six's", three Jorge's, a surviving team of ODSTs, and the sole survivor of The Savannah.
Rated: T - English - Sci-Fi - Chapters: 3 - Words: 19,484 - Reviews: 43 - Favs: 193 - Follows: 286 - Updated: 10/4/2021 - Published: 3/17/2021 - Jorge-052/Noble Five, SPARTAN-B312/Noble Six, Shepard
Reckoning of the Reclaimers (v2) by metts101 reviews
After the Great War Humanity was a different creature. Their brush with extinction left them cold and vengeful, and so they sought revenge for the transgressions of the Covenant species. With their eradication Humanity, driven by xenophobia, took their position as the unrivalled power in the galaxy. However, will a xenophilic alien federation, in a new galaxy, change their outlook?
Rated: T - English - Sci-Fi - Chapters: 1 - Words: 11,625 - Reviews: 20 - Favs: 164 - Follows: 238 - Published: 9/24/2021
Reckoning of the Reclaimers (Being Rewritten) by metts101 reviews
The Great War turned Humanity into something ugly. Their species' brush with extinction left a bitter taste in their mouths and they sought to rectify that the only way they knew how. Revenge. With the the subjugation of the Former Covenant species Humanity vowed never to fall to the alien again, but will an Alliance of Alien species change their outlook on the galaxy?
Rated: T - English - Sci-Fi - Chapters: 6 - Words: 41,721 - Reviews: 75 - Favs: 282 - Follows: 374 - Updated: 9/22/2021 - Published: 11/14/2020
Mass Effect: Lost Son of Terra by Ares007 reviews
The Reapers had a system. They let Civilizations grow, then harvested once they were at their peak. What will happen when a wrench is thrown into that system in the form of Erwin Wolff. A broken man whose sole purpose was to kill Xenos. Pulled into a Xenophilic Galaxy. How will he deal with the Mass Effect trap and navigate new aspects of his life?
Rated: M - English - Adventure/Romance - Chapters: 12 - Words: 122,661 - Reviews: 35 - Favs: 165 - Follows: 219 - Updated: 9/21/2021 - Published: 6/29/2021 - [SPARTAN-B312/Noble Six, Oriana L.] [Shepard, Miranda L.]
Ascendant by evevee reviews
A single ship can change a galaxy. The Normandy had already proven that, yet much like that vessel this new wreck was also dead. So it seemed at first at least, but just because something is dead does not mean it is forgotten.
Rated: K+ - English - Sci-Fi - Chapters: 5 - Words: 38,561 - Reviews: 205 - Favs: 589 - Follows: 649 - Updated: 9/18/2021 - Published: 8/21/2021 - Liara T'Soni - Complete
The Might of Humanity by Builder of Stories reviews
Humanity moving much more quickly has changed everything. Their early development and discoveries propelled themselves into the future with peace in one hand and their might ready in the other. Is the galaxy ready, for a powerful Humanity
Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 6,980 - Reviews: 33 - Favs: 264 - Follows: 387 - Published: 9/3/2021 - [Tali'Zorah, Miranda L., Shepard] C. Halsey
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
Rated: M - English - Sci-Fi/Tragedy - Chapters: 14 - Words: 90,584 - Reviews: 886 - Favs: 2,382 - Follows: 3,200 - Updated: 8/19/2021 - Published: 5/10/2019 - Master Chief/John-117, T. Hood, Admiral Hackett, Councilor Sparatus
Final Reclamation Halo Wars by Harambe 117 reviews
master chief finds himself in a new galaxy with its own dark secrets lurking in black space. A new revelation is about to begin
Rated: M - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 14,072 - Reviews: 9 - Favs: 19 - Follows: 32 - Published: 8/5/2021
Rookies return by predator1701 reviews
Its been eight years since the end of the Reaper War, ten years since the creation of the Coalition. Now after many years of rebuilding Rookie is called back to command the Coalitions' latest exploration vessel. His mission, to explore strange new worlds, to seek out new life and new civilizations to boldly go into battle where none have battled before
Rated: T - English - Sci-Fi/Romance - Chapters: 1 - Words: 5,263 - Reviews: 1 - Favs: 10 - Follows: 10 - Published: 8/2/2021 - Complete
Once a Rookie, Always a Rookie by Twisted Fate MK 2 reviews
(Credit to Adrasos on Archive and his story, Prepare to Drop, for the idea.) On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, while Shepard tries to find and rescue the new Primarch. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix.
Rated: T - English - Adventure - Chapters: 62 - Words: 293,819 - Reviews: 586 - Favs: 1,088 - Follows: 1,355 - Updated: 7/31/2021 - Published: 9/27/2018 - Rookie, Shepard, Javik - Complete
The Lost Civilization by Apollonir reviews
After the Battle of the Ark, a UNSC Pelican dropship crash lands on Thessia. Two ODSTs survive the crash and make contact with primitive Asari. Ninety thousand years later, Liara T'Soni discovers a strange looking aircraft and Human remains in an ancient cave burial chamber. The discovery she makes will take the Asari on a journey to discover their true lineage.
Rated: T - English - Mystery/Suspense - Chapters: 16 - Words: 33,722 - Reviews: 664 - Favs: 1,930 - Follows: 2,705 - Updated: 7/26/2021 - Published: 7/2/2017 - Ashley W., Liara T'Soni, Mordin S., Shepard
Unforeseen turns of the war by Batrix2070 reviews
When everything seems to be going in the right direction Shepard learns of an old accident that forces him to seek allies in other universes.
Rated: T - English - Adventure/Sci-Fi - Chapters: 7 - Words: 38,284 - Reviews: 3 - Favs: 19 - Follows: 27 - Updated: 7/26/2021 - Published: 1/26/2021 - Master Chief/John-117, SPARTAN-B312/Noble Six, Admiral Hackett, Shepard
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