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The Seven Year's War has ended in a bloody stalemate. The resolves of each faction weak, The Three Champions Ayu, Cross, and Stigandr have settled a council of the Warborn, Legion, and the Chosen to achieve peace and restore the land. Not one Viking, Samurai, or Knight could have predicted a god would come and beg for their help, for them to raise their blades in a new war.
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Equestria has fallen. The Dragons, Griffons, and Minotaurs have united, and conquered the once soveriegn land. Only the Crystal Empire remains, though it cannot last. Celestia sends a prayer to the sky, and the sky answers. Faust disguises herself as a mere human and journeys to the lands of the three, to beg for their help. She arrives as the Viking, Knight, and Samurai settle for peace.

...Not for long. Faust rallies the three warrior kin into a new army, one that will retake Equestria and restore it to glory and honor

But it won't be easy. At least...for the enemy.
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For Honor crossover, set after the end of the game. Features three OCs. Rated mature for gore and blood.