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All the Stars by
BlueWay reviews
When the Long Night of Solace is evaporated over Reach via the weaponized usage of a Slipspace Drive, it ferries with it in its swallowed sections the Covenant Empire and, more horrifyingly, the desperate measures that the UNSC used to fight them. When they are found in a universe on the precipice of their own history, the meaning of the term "Mass Effect" will change forever.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 20 - Words: 362,913 - Reviews: 460 - Favs: 750 - Follows: 982 - Updated: 8/27 - Published: 6/8/2018 - SPARTAN-B312/Noble Six, Rookie, Shepard (F)
The Reclamation has already begun by
Fade Maybe reviews
The Citadel Council and the Systems Alliance fight for survival against the Reaper onslaught. However, the UNSC, politically divided and still recovering from the Didact's assault discovers a Mass Relay that will force them into the fight and change the course of galactic history forever. The Reclamation has already begun, and we are hopeless to stop it. ME3/post Halo 4
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 36 - Words: 355,591 - Reviews: 1089 - Favs: 1,196 - Follows: 1,557 - Updated: 8/23 - Published: 3/13/2013
To Infinity by
creamofwheat2311 reviews
After discovering an ancient artifact, the UNSC's most advanced warship and a Sangheili Assault Carrier are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 46 - Words: 390,407 - Reviews: 3556 - Favs: 4,090 - Follows: 4,909 - Updated: 7/25 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, Shepard (M)
Book One: Dawn of a New Age by
DragonheartODST reviews
Humanity had been expanding across the stars for over 5 centuries in relative peace. But an alien alliance known as the Covenant wishes to destroy humanity entirely. Now threatened with extinction, can the fate of just one battle-scared survivor change the events of the war and those participating in it? Multi-crossover with Halo, Mass Effect, and a little bit of StarCraft.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure - Chapters: 13 - Words: 131,084 - Reviews: 285 - Favs: 292 - Follows: 347 - Updated: 7/14 - Published: 5/19/2016
The Spartan Effect by
Gatekeeper333 reviews
Everyone's favorite Spartan is looking for a new purpose, lucky for him, the Commander his happy to oblige. (5-23-19 Info: On Hiatus after Chapter 45. Will update with schedule after life is in order.)
Crossover - Halo & Mass Effect - Rated: T - English - Chapters: 45 - Words: 495,928 - Reviews: 1682 - Favs: 2,363 - Follows: 2,928 - Updated: 5/23 - Published: 3/27/2011 - Master Chief/John-117, Tali'Zorah, Miranda L., Shepard (M)
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: 20 - Words: 225,409 - Reviews: 1317 - Favs: 2,108 - Follows: 2,787 - Updated: 2/21 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Shepard (F), Garrus V.
War, Peace, and other Galactic Customs by
The Almighty Afroduck reviews
After a long, terrible war, the Federation of Sovereign Empires forms as the product of the alliance created early in the Great War between the Covenant Separatists and the UNSC. Time passes as they progress greatly, eventually discovering the existence of other galactic governments. The events that will follow will change the course of the galaxy in more ways than one. PART- 3
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 33 - Words: 375,183 - Reviews: 623 - Favs: 984 - Follows: 1,212 - Updated: 1/29 - Published: 3/1/2014
Merged Galaxy Part 1: Tenuous Pacts by
Slipspace Anomaly reviews
Nations collide as 2 alternate versions of the Milky Way Galaxy are joined into 1. As members of the SGC and the UNSC struggle to establish peaceful relations, a new threat emerges. One that includes new enemies from each of their pasts. Co-written with Jon Harper.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Chapters: 21 - Words: 164,926 - Reviews: 201 - Favs: 279 - Follows: 378 - Updated: 10/8/2018 - Published: 1/30/2017 - H. Maybourne, OC, Master Chief/John-117, C. Halsey
Fraught with Peril: A Halo Mass Effect Story by
A-01 reviews
John was born for war, and even in the wake of defeating the Didact, there will be no respite. Thrust into the Mass Effect Universe he must either find his place or find his way home as his presence brings new hope to Shepard and his campaign against the approaching Reaper armada.
Crossover - Halo & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 15 - Words: 151,659 - Reviews: 233 - Favs: 603 - Follows: 811 - Updated: 1/28/2018 - Published: 12/16/2016