2k+ Enduring the Flames of War » by Masterdude21 A joint Asari-Turian operation salvaged a "package" from a derelict wreckage in the Terminus Systems, whereupon they release a force of war beyond their reckoning. Hoping to avoid another war, Commander Shepard recruits the "package" into her team. A simple act of kindness, unwittingly paving the way for a clash unlike the galaxy has ever seen. Fate directs the flames of war.
Halo & Mass Effect, M, English, Sci-Fi & Horror, chapters: 41, words: 585k+, favs: 3k+, follows: 4k+, updated: 9/9 published: 11/30/2015, Master Chief/John-117, OC, Shepard
872XCOM: The Advent Directive » by Xabiar Australia has been annexed, the United Nations is in chaos, the world is under siege and the Ethereals have taken the field. Facing the full might of the Ethereal Collective, the Commander must rally XCOM, the newly formed ADVENT, and several other allies and rivals to unite the divided nations by any means necessary, for failure now will mean the fall of humanity once and for all.
X-Com, M, English, Sci-Fi & Drama, chapters: 77, words: 1751k+, favs: 368, follows: 381, updated: 8/8 published: 5/5/2017, Dr. Vahlen, Dr. Tygan, R. Shen, OC
50Enigma » by Trackhawk It became very clear that this was not your everyday Sergeant who was addressing me. No, this was the voice of complete authority. Pure and utter respect was demanded from that voice, and nothing less would do. A small shiver of fear and admiration ran through my body. Not only because of what they meant, but because of who they were delivered by. "Drew Crawford, Squad Lockdown."
X-Com, T, English, chapters: 30, words: 109k+, favs: 23, follows: 42, updated: 8/2 published: 7/28/2014, Bradford, Big Sky, OC
264 The Fifth-Race Reclaimers » by Piero217 The Four Great Races once watched over thousands of worlds… but only one species was destined to inherit their place. Now, as an ancestral enemy rises from the ashes and threatens all life as we know it, humans from two different universes must learn to overcome their differences and stand together to reclaim the Mantle of Responsibility. Set shortly after the events of Spartan Ops
Halo & Stargate: Atlantis, T, English, Sci-Fi & Adventure, chapters: 26, words: 166k+, favs: 427, follows: 451, updated: 1/23 published: 6/1/2013, Master Chief/John-117, C. Halsey, Cortana, John S.
127 Hammer Effect » by wyval Humanity successfully reached for the stars, confident in their ability to conquer all who stand against them. Yet in the darkness of space, an ancient menace stirs, that could possibly eclipse all past enemies Humanity faced - including those from the depths of time they faced in the wars for Terra itself...
Warhammer & Mass Effect, M, English, Sci-Fi & Supernatural, chapters: 36, words: 202k+, favs: 217, follows: 252, updated: 12/3/2020 published: 7/7/2016, Liara T'Soni, Shepard, Kai Leng
2k+ Biomass Effect » by Beastrider9 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.
Mass Effect & Prototype, M, English, Sci-Fi, chapters: 63, words: 342k+, favs: 4k+, follows: 4k+, updated: 10/9/2020 published: 8/8/2014
263 Stargate Effect » by ResurgentClone The Lucian Alliance is defeated, the line has been held against the Wraith in orbit around Earth. Now it's time for Atlantis to yield it's secrets.
Stargate: SG-1 & Mass Effect, T, English, Sci-Fi, chapters: 14, words: 27k+, favs: 419, follows: 578, updated: 6/2/2020 published: 9/26/2012
1k+ XCOM: Remnant Unknown » by DrAmishMD The sequel to XCOM: RWBY Within. Teams RWBY and JNPR return to Remnant in time for the Vytal Festival. They're relieved to finally have their lives get back to normal after nine months on war-torn Earth, but is the life of a huntsman ever truly normal?
X-Com & RWBY, M, English, Adventure & Sci-Fi, chapters: 48, words: 488k+, favs: 1k+, follows: 1k+, updated: 2/20/2020 published: 7/22/2016, Team RWBY, Team JNPR
2k+Fairy Dance of Death » by Catsy AU reboot of the entire SAO storyline, beginning from the premise that Kayaba Akihiko was obsessed with magic and Norse Mythology rather than swords and pure melee. As a result, he created the Death Game of Alfheim Online rather than the floating castle of Aincrad—a world in which PvP is not a crime, and the nine player races are in competition to escape. **SPOILERS IN REVIEWS**
Sword Art Online/ソードアート・オンライン, T, English, Drama & Adventure, chapters: 50, words: 696k+, favs: 4k+, follows: 4k+, updated: 1/24/2020 published: 11/6/2012, Kirito/Kazuto K., Asuna/Asuna Y., Klein/Ryoutarou T., Argo
45 Twin Legions » by deadliestfan Worlds collide as Azeroth and the world of Warhammer Fantasy are maneuvered into connection by scheming gods. A portal appears in Norsca, one that entities on both worlds are eager to utilize as mortals are left to deal with the consequences. The novel side of my Warhammer-Warcraft crossover.
Warhammer & Warcraft, T, English, Fantasy & Adventure, chapters: 8, words: 63k+, favs: 61, follows: 72, updated: 10/11/2019 published: 5/27/2018
78 The Lost Prince Of Caledor » by PrinceOfCaledor When Imrik finds himself thrown into a world that is not his own, he meets Eragon and decides to fight at his side. it doesn't matter that they are outnumbered or that he doen't know what he is up against. He is a child of Ulthuan and he will previal.
Warhammer & Inheritance Cycle, T, English, Fantasy & Adventure, chapters: 14, words: 115k+, favs: 158, follows: 122, updated: 3/10/2019 published: 2/21/2012, High Elves, Arya
3k+ The Last Spartan » by DinoJake An AU fic in which the Halo and ME universes share the same galaxy. After a well deserved rest in Cryo-Sleep, Master Chief finally awakens...to a whole new galaxy.
Halo & Mass Effect, T, English, Sci-Fi & Adventure, chapters: 55, words: 489k+, favs: 4k+, follows: 4k+, updated: 12/31/2018 published: 5/2/2010, Master Chief/John-117
702 The Human War » by Generatedname The Citadel Council is a peaceful conglomerate of races, blissfully unaware of the horrors that lurk beyond their space. Humanity, meanwhile, is a race that has fought against these alien horrors ever since they made contact. What will happen when the two societies meet? Will peace follow war? Or is the Citadel Council doomed to fall to humanity? Rewrite of When Civilizations Meet.
X-Com & Mass Effect, T, English, Sci-Fi, chapters: 13, words: 138k+, favs: 1k+, follows: 2k+, updated: 5/30/2018 published: 3/29/2016
16 The Rising Action » by Spc. Knox (WARNING: This is a blend between Legends and a Canon Story) The Empire always told me back in the Academy… that in order for a simple cadet to make his way into the ranks of the Empire, they had to be determined, driven, and always put their best effort to make sure the Empire comes out on top, and as a rising Imperial Officer, that is a given.
Star Wars, M, English, Sci-Fi & Adventure, chapters: 21, words: 100k+, favs: 37, follows: 37, updated: 4/18/2018 published: 4/22/2017, Darth Vader, Thrawn, OC, O. Krennic
1k+ Psi Effect » by Cap'n Chryssalid 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...
X-Com & Mass Effect, T, English, Humor & Sci-Fi, chapters: 43, words: 387k+, favs: 3k+, follows: 4k+, updated: 1/2/2018 published: 7/19/2014, U. Wrex, Daro'Xen, J. Garson, OC
84 The War of Fates » by PrinceOfCaledor Sequel to Lost Prince of Caledor. Imrik of Caledor has returned to Ulthuan, Eragon continues to train and the flames of war stir in Alagaesia. As time runs thin and the Varden prepare to confront Galbatorix in the field, can Imrik gather enough support in the fickle courts of Ulthuan to return with the armies he promised? A new evil is rising, and only he can halt its growth.
Warhammer & Inheritance Cycle, T, English, Adventure & Fantasy, chapters: 8, words: 92k+, favs: 151, follows: 168, updated: 12/11/2017 published: 11/18/2013, High Elves, Arya, Eragon S., Saphira
3k+ The Stars Alone » by Darth Marrs Sequel to Broken Chains. Every choice has a consequence. Every action has a price. Their financial empire lost, their allies turned against them for crimes they actually did commit, Harry, Hermione and Luna are exiled from Earth. The Goa'uld have no idea what is about to hit them, because the stars alone know how far they will go.
Stargate: SG-1 & Harry Potter, M, English, Drama & Fantasy, chapters: 62, words: 287k+, favs: 2k+, follows: 2k+, updated: 10/21/2017 published: 7/8/2016
2k+ The Swarm of War » by VexMaster A nerd has reincarnated as a Zerg Larva... and now he has been dropped into the Warhammer 40K. There is no time for peace. No Respite. No forgiveness. There is only WAR and the Swarm!
StarCraft & Warhammer, M, English, Sci-Fi, chapters: 87, words: 582k+, favs: 3k+, follows: 3k+, updated: 8/12/2017 published: 6/14/2011
108Rise of the Je'daii Empire » by SaiyatonianSage Jedi and Sith, the anomalies of the Force that has caused an imbalance for millennias and now it has created the Clone Wars. Ralem Solstice, born from the Force and the Father, leader of the Je'daii Order (ancestors to the Jedi) shall bring a new dynasty to the galaxy as he brings true peace to everyone through eliminating the corrupt both in the Seperatists and the Republic.
Star Wars: The Clone Wars, M, English, Adventure & Romance, chapters: 13, words: 116k+, favs: 421, follows: 403, updated: 8/9/2017 published: 6/8/2015, [OC, Ahsoka T., Barris Offee, R. Chuchi]
568 Event Horizon Book 1: Autumn's Frontier » by Spartan-168-Django The Realm is forever changed when a new player in the Game arrives: space explorers from future Earth, looking for a planet just ripe for colonization. But just what awaits the people of Earth here in the World of Ice and Fire? And how will their powerful technology and ideas transform Westeros, for better or worse? Let the adventure begin!
A song of Ice and Fire, M, English, Sci-Fi & Parody, chapters: 114, words: 297k+, favs: 703, follows: 502, updated: 7/28/2017 published: 2/1/2015, Daenerys T./Dany, Jon S., Eddard S./Ned, Robb S.