Halo x Mass Effect Crossovers
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The Sins of our Fathers by Jabber_the_very_wocky
Fandoms: Halo (Video Games) & Related Fandoms, Mass Effect Trilogy
12 Feb 2026
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Summary
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 investigates the sudden disappearance of fringe colonies.
When they activate relay 314 to investigate the sources of the pulse, the are unprepared for what they find. How will the Citadel mourn the loss of a civilization they never knew existed, and how will they handle the technology dropped in their laps?
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Bookmarked by Winsome248
12 Dec 2023
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Mass Effect-Halo Xovers
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Reclamation by PointyCircle
Fandoms: Halo (Video Games) & Related Fandoms, Mass Effect Trilogy, Mass Effect: Andromeda, Mass Effect - All Media Types, Mass Effect - Various Authors, Mass Effect: Paragon Lost
25 Mar 2022
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Summary
A UNSC cruiser activates a dormant Relay, forcing the politically divided UNSC into a new war against the Reaper menace. Discovering the races of the Citadel, and more importantly a second form of Humanity, the stage is set for events that will utterly shatter the Galaxy. The UNSC must fight not just conventional enemies, but enemies within.
The Master Chief, distraught after the loss of Cortana to the Didact, will find himself once again in the middle of Humanity's greatest struggle. Commander Shepard and the crew of the Normandy after fighting the Reapers and Cerberus for several months must confront the reality of dealing with an extremely brutal and militaristic branch of Humanity: The UNSC, who refuse to transfer power to a civilian government after the events of Requiem.
Only one group can claim the Mantle of Responsibility. War is inevitable. Political intrigue a given. Death is certain.
The Reclamation has already begun, and we are hopeless to stop it.
(Post Halo 4/ mid-ME3. Paragon Male Shepard. AU - background statistics and some alterations to technology.)