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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: 4,077 - Follows: 4,896 - Updated: 7/25 - Published: 10/9/2013 - Master Chief/John-117, Arbiter, T. Lasky, 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: 1316 - Favs: 2,102 - Follows: 2,784 - Updated: 2/21 - Published: 2/21/2017 - Master Chief/John-117, Cortana, Shepard (F), Garrus V.
The Unknown Defender by
Gabenator5 reviews
While Shepard is closing in on Saren. Stories begin to spread among the pirates and slavers of the galaxy. Rumors of a nameless fear, of a creature, a demon wreathed in green armor. It and its allies appear from nowhere slughtering all who oppose them, then vanish without a trace. What is the purpose of this unknown faction... and what will they do next?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 17 - Words: 115,734 - Reviews: 1006 - Favs: 2,634 - Follows: 3,441 - Updated: 1/13 - Published: 9/27/2016 - Master Chief/John-117, Cortana, Shepard (F), Tali'Zorah
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.
Crossover - Halo & Mass Effect - Rated: T - English - Mystery/Suspense - Chapters: 8 - Words: 15,182 - Reviews: 411 - Favs: 1,268 - Follows: 1,838 - Updated: 1/6 - Published: 7/2/2017 - Ashley W., Liara T'Soni, Mordin S., Shepard (M)
Humanity's Rebirth by
TallYapflip reviews
The First Contact War brought untold destruction to Earth, reducing Humanity to a shell of its former self. For 900 years, Humanity has been working tirelessly to lay claim to its own slice of the Milky Way Galaxy, and they are prepared to bring the Council to its knees to accomplish their goals. (Massive AU, New Technologies, and a far different humanity.)
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 21 - Words: 105,791 - Reviews: 487 - Favs: 1,752 - Follows: 2,196 - Updated: 12/17/2018 - Published: 3/4/2016 - [Samantha T., Shepard (F)] Admiral Hackett, OC
Lost Legacy by
Andrithir reviews
There are stories about them, myths and legends of once majestic species overseeing the galaxy and exploring into the space that lay beyond. There were stories about them, tales of faded past. Humanity's missing link. (Rewrite Chapters 1 to 3 now posted) COMPLETED. Rewrites are on hiatus.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 67 - Words: 328,897 - Reviews: 1631 - Favs: 1,419 - Follows: 1,318 - Updated: 2/20/2015 - Published: 10/8/2011 - Master Chief/John-117, Shepard (F) - Complete
Clairvoyant by
Andrithir reviews
A chance to change the outcome of the war... After STCDR Adam Shepard brings an end to the Reaper War, he finds himself back where he can influence the inevitable invasion. Under the command of STCDR Iolanthe Shepard, Adam plans preemptive strikes across the galaxy to buy precious time.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 13,816 - Reviews: 23 - Favs: 34 - Follows: 55 - Updated: 7/25/2014 - Published: 7/18/2014 - Shepard (F), Shepard (M)
Office of Naval Intelligence Special Activities Division by
Andrithir reviews
The Human-Covenant War is over, but humanity's internal conflicts will never cease. Spartan-II Blue Team has been reassigned to ONISAD to retake the mantle of their original purpose, clandestine and covert operations.
Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 4,632 - Reviews: 10 - Favs: 18 - Follows: 24 - Published: 2/28/2013 - Master Chief/John-117, Kelly-087
The End Of A Hero, The Start Of A Legend
Commander Shepard has to end the war some how but is the choice really what she wanted
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 1,467 - Favs: 1 - Follows: 1 - Published: 7/20/2014 - Shepard (F), Garrus V., Liara T'Soni