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Bellum Terranum by F35B reviews
In the year 2585 the Humans have mostly recovered from the effects of the Human-Covenant War, however unknown to them, there is a much larger Galaxy out there... one that doesn't take kindly to humanity and their... antics... PM me suggestions, I'm open to constructive criticism, Pls Read & Review (Slight HFY)(AU)
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 3 - Words: 15,538 - Reviews: 29 - Favs: 124 - Follows: 168 - Updated: 1h - Published: 7/31
Noble Intent by In BRRRRRRT We Trust reviews
Without warning, her world went dark, but that's not where her story ends. When Catherine - B320 wakes up in a small room surrounded by others wielding legendary weapons, she quickly realizes what she's in for and now has to adapt to a different kind of hell. Will she fall just as she did on Reach? Or will she bring about a change solidifying her status as a demon?
Crossover - Halo & Rising of the Shield Hero/盾の勇者の成り上がり - Rated: M - English - Adventure/Fantasy - Chapters: 7 - Words: 46,837 - Reviews: 52 - Favs: 205 - Follows: 242 - Updated: 5h - Published: 6/27 - Catherine-B320/Kat/Noble Two, Raphtalia
Penumbra: Black Plague by Ginopippofreebooter reviews
A pen, a notebook and some time alone. That is all that the Young Wolf Jake needed and unlike his Titan comrades, he liked to report new findings and informations on it. So, what happens when a Taken anomaly guides him to a seemingly giant ring in the middle of space? (Set from the start of Halo 1 to 3.) (Cover by Abrax1245/Ikarus Prime, follow him on Reddit).
Crossover - Halo & Destiny - Rated: T - English - Sci-Fi/Adventure - Chapters: 23 - Words: 83,695 - Reviews: 137 - Favs: 248 - Follows: 321 - Updated: 6h - Published: 6/26/2021 - Master Chief/John-117, Cortana, Ghost, Guardian
The Last Metroid by ShadowLight223 reviews
Her Metroid dna has taken over, resulting in a monstrous transformation. Unable to control her powers, when attempting to escape ZDR, her ship loses power due to her actions. She can't remember what happened after that, but now, all she sees is the blackness of space, left drifting, alone. In the distance, the broken body of a frigate is seen, with the name of Forward Unto Dawn…
Crossover - Metroid & Halo - Rated: M - English - Sci-Fi/Suspense - Chapters: 24 - Words: 110,949 - Reviews: 226 - Favs: 303 - Follows: 445 - Updated: 8h - Published: 9/20/2022 - Samus A., Master Chief/John-117
Halo: RWBY Evolved by Danilyss reviews
After what was thought to be a simple mission, team RWBY wind up as stowaways aboard a phantom on the Seeker of Truth as it rendezvous with the Fleet of Particular Justice in order to await for the arrival of the Pillar of Autumn. Now caught in a war none of the girls would ever have imagined, they must fight alongside the Master Chief and the Marines against the Covenant.
Crossover - Halo & RWBY - Rated: T - English - Sci-Fi/Horror - Chapters: 3 - Words: 24,495 - Reviews: 21 - Favs: 66 - Follows: 94 - Updated: 9h - Published: 5/12 - Master Chief/John-117, A. J. Johnson, Cortana, Team RWBY
The Reclaimer of Mandalore by UNSC indomitable reviews
Having been awoken by his faithful companion. The Master Chief and Cortana find themselves in an unknown galaxy. Knowing the only way to survive is to remain under the radar. But in a galaxy gripped by war, such a thing was never going to be easy. As the Chief try's to up hold the status quo in the ever changing world of Mandalore, as the galaxy slowly torn apart around them.
Crossover - Star Wars & Halo - Rated: T - English - Sci-Fi - Chapters: 18 - Words: 109,977 - Reviews: 401 - Favs: 1,117 - Follows: 1,509 - Updated: 20h - Published: 11/25/2020 - OC, Master Chief/John-117, Cortana
Horizon War:Tales of the UNSC-Citizen Federation War by Johnnieboy11 reviews
A chance encounter with Forerunner Technology leads the UNSC to discover a two-way portal which leads into a Universe so similar, yet ever so different from their own. First contact with said Universe's humanity, however, goes awfully wrong, sparking the greatest war since the Human-Covenant War. These are the tales of those who fought in it.
Crossover - Halo & Starship Troopers - Rated: M - English - Adventure/Sci-Fi - Chapters: 8 - Words: 29,740 - Reviews: 97 - Favs: 158 - Follows: 217 - Updated: 23h - Published: 6/13 - [J. Rico, Dizzy F.] C. Halsey, T. Lasky
Wrong Place, Right Time: A Hero's Story by DLTA-BOT reviews
The journey of a hero doesn't always start where they expect. It doesn't always happen to those who expect it. Damon was never interested in being what SPARTANs represent: an implacable force for good standing as humanity's shield. Like most other third-generation SPARTANs, the war took everything from him. All he wanted was to return the favor. Sometimes we don't get a choice.
Crossover - Fallout & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 75 - Words: 885,380 - Reviews: 210 - Favs: 425 - Follows: 463 - Updated: 8/11 - Published: 9/29/2020 - Sole Survivor, Arthur Maxson, Shaun, OC
The Iron Cross by Lighting wolf knight reviews
Scattered, in a world where their emperor never existed... The Ultramarines have but one purpose... Protect humanity and act among them. Rated T for violence, death, and profanity. Read next chapter Author Notes for important news.
Crossover - Warhammer & Halo - Rated: T - English - Adventure/Romance - Chapters: 8 - Words: 26,493 - Reviews: 48 - Favs: 82 - Follows: 105 - Updated: 8/11 - Published: 7/15 - Space Marines, OC, Arbiter, Linda-058
Still in the fight by Scepter 2-1 actual reviews
Team Prime battles to defend Earth from the Decepticons with the help of their human allies. Then one day, a mysterious ship shows up, straight out of another war, carrying one of its most hardened veterans with one of his closest friends. A man known to the enemy as a Demon. Cover image is not mine.
Crossover - Halo & Transformers/Beast Wars - Rated: T - English - Sci-Fi/Adventure - Chapters: 11 - Words: 40,066 - Reviews: 74 - Favs: 203 - Follows: 253 - Updated: 8/10 - Published: 12/13/2021 - Arcee, Bulkhead, Jack D., SPARTAN-B312/Noble Six
Halo: The Culmination Of Sins by Reaper Eye Fuck ONI
The Great Cold War has raged on for Three Centuries with neither side able to gain the advantage to destroy the other all 3 factions wait for the inevitable Showdown and that showdown was Harvest, this planet out in the middle of nowhere would become the spark that would light the Galaxy on fire but not in the way anyone would think...
Crossover - Halo & Killzone - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 2,362 - Favs: 7 - Follows: 9 - Published: 8/10 - A. J. Johnson, Arbiter
The ONI Offensive by MrChef99 reviews
A small killteam of Spartan 3's are approached by the assassin's brotherhood during an OP against insurrectionists and are told the truth about ONI, and their plot to continue the Human-Covenant war so that they can be led to more forerunner artifacts to unlock the true potential of the apple of Eden.
Crossover - Halo & Assassin's Creed - Rated: T - English - Sci-Fi/Mystery - Chapters: 3 - Words: 1,933 - Reviews: 1 - Follows: 1 - Updated: 8/10 - Published: 7/22
Harry Potter got trained by Driver1985 reviews
On the night Harry would have been dropped off by his Aunt, Dumbledore had someone else in mind. What if Harry was taken in by other strong people and they even decided to train him? Trained to be a Warrior by Wolves and the UNSC, he will change the world. OP, smart, trained Harry, small harem double cross with Witcher and Halo
Crossover - Harry Potter & Halo - Rated: M - English - Fantasy/Sci-Fi - Chapters: 83 - Words: 412,510 - Reviews: 324 - Favs: 698 - Follows: 825 - Updated: 8/10 - Published: 9/30/2021 - [Harry P., Hermione G., Daphne G.] Master Chief/John-117
Different world, but the mission remains by Ranger2287 reviews
Still can't think of a summary
Crossover - Halo & Xenoblade Chronicles 2 - Rated: T - English - Chapters: 3 - Words: 16,351 - Reviews: 2 - Favs: 5 - Follows: 9 - Updated: 8/10 - Published: 8/17/2022 - Master Chief/John-117, Cortana, KOS-MOS, T-elos
Fleet of the Homeward Bound: Book two by Sora with an S reviews
Spirit of Fire, Hyperion, Jupiter II, Archangel and a few Firestorms just want to know where they are and how to get home. Also, they want to know why they're all girls in space now.
Crossover - StarCraft & Halo - Rated: T - English - Chapters: 1 - Words: 9,731 - Reviews: 6 - Favs: 12 - Follows: 14 - Published: 8/9
Xcom: Fire From Above by StalinWithDaSpoon reviews
XCOM was losing. It lost the first contact war, and now it was losing the resistance war. Even with the Commander to lead them, they had made little progress in destabilizing the aliens regime. But this would change with a new factor being added to the battle, as what can only be described as Fire From Above.
Crossover - X-Com & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 10,287 - Reviews: 8 - Favs: 43 - Follows: 66 - Updated: 8/9 - Published: 7/19 - Bradford, J. Cutter, E. Anders, Jerome-092
Fireteam Mystic by Vandal1037 reviews
Dr. Catherine Halsey recives horrific visions of a future where humanity is crushed and destroyed beneath an iron boot. Her spartans were not enough to weather the coming storm. However her visions lead her into somethig more, a long lost power and a chance to help humanity rise to the top of the food chain.
Crossover - Harry Potter & Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 7 - Words: 29,027 - Reviews: 36 - Favs: 79 - Follows: 129 - Updated: 8/8 - Published: 7/23 - Harry P., Ron W., Master Chief/John-117, C. Halsey
Boku No Halo Academia: For Want of a Mustard Seed by Iowaman24 reviews
Eleven years have passed since the apocalyptic collapse at the end of the Third World War, and under Aurdel Ganowicz's oversight much of Japan has been rebuilt. However many are still unhappy with the way things are, and as a result the League of Villains has returned. But without an ideology, and under a seemingly revived former member, they are hellbent on destroying everything.
Crossover - Halo & My Hero Academia/僕のヒーローアカデミア - Rated: M - English - Sci-Fi/Drama - Chapters: 3 - Words: 13,375 - Reviews: 1 - Favs: 7 - Follows: 8 - Updated: 8/8 - Published: 7/29 - OC, Izuku M., 1-A Students
Noble 6: Ghost of Reach by thermalsnipern7 reviews
The war against the Covenant ended, but something else pressed humanity to the verge of extinction like they never did. Now, Noble 6 rises again to defend humanity like he had done before, and make humanity into something strong like it was so long ago. The one thing his enemies keep wondering is why they hear boss music.
Crossover - Halo & Destiny - Rated: M - English - Sci-Fi/Romance - Chapters: 8 - Words: 34,067 - Reviews: 29 - Favs: 101 - Follows: 116 - Updated: 8/8 - Published: 7/31/2022 - [SPARTAN-B312/Noble Six, Fallen]
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: 22 - Words: 120,421 - Reviews: 123 - Favs: 272 - Follows: 407 - Updated: 8/8 - Published: 2/21/2022
Men and Machines by 1DL1NG KN1GHT reviews
It has been four years since the Human-Covenant War. The Master Chief is caught in a battle between the Republic warships and the Malevolence. But a war-torn UNSC will not want to be involved in another, and soon the Didact’s release approaching, peace never seems to last. But secretly, Lord Sidious is expanding his chessboard, with a new plan to reach to both worlds…
Crossover - Halo & Star Wars: The Clone Wars - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 20,656 - Reviews: 35 - Favs: 78 - Follows: 89 - Updated: 8/8 - Published: 4/12 - Master Chief/John-117, General Grevious, Count Dooku, Jorge-052/Noble Five
Halo ALT: Remnant by scouttroop reviews
In an Alternate Universe, the UNSC has colonized a disserted Remnant while at war against the United Rebel Front. Meanwhile Pyrrha Nikos who lost her fight against Cinder Fall lands in this Alternate Universes and stranded. Pyrrha herself would join the UNSC since there is probably no way back to her dimension. Alternate Universe Setting and Chapters will be EXTENDED.
Crossover - Halo & RWBY - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 3,491 - Reviews: 4 - Favs: 16 - Follows: 19 - Updated: 8/8 - Published: 7/29 - Catherine-B320/Kat/Noble Two, Carter-A259/Noble One, SPARTAN-B312/Noble Six, Pyrrha N.
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: 467 - Follows: 534 - Updated: 8/7 - Published: 4/22/2016 - Master Chief/John-117, Cortana, Tali'Zorah, Shepard
Dust and Echoes by trestwho reviews
After a successful mission, a UNSC fleet makes a random slipspace jump only to come across an uncharted system containing a sliver of humanity, one with seemingly no connection to Earth and whose natural abilities defy reason. In a galaxy full of terrifying dangers, the UNSC and Remnant must work together to defend all they know from annihilation.
Crossover - Halo & RWBY - Rated: M - English - Sci-Fi/Adventure - Chapters: 30 - Words: 371,440 - Reviews: 1261 - Favs: 1,452 - Follows: 1,609 - Updated: 8/7 - Published: 1/12/2020 - Master Chief/John-117, Arbiter, Team RWBY, Team JNPR
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: 377 - Favs: 1,030 - Follows: 1,422 - Updated: 8/7 - Published: 2/11 - Cortana, Councilor Valern, Councilor Tevos, Councilor Sparatus
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