Title: A Twist in Time

Main Characters: Twilight Sparkle, the Mane Six, Spike, Starlight Glimmer.

Genre: Dark, Adventure, Alternate Universe.

Premise:
Twilight attacks Starlight right as she stops Rainbow Dash from performing her first Sonic Rainboom, sending them both flying into the portal, due to her interference several alternate timelines stemmed from that one event not happening end up converging upon one another and co-existing in the same reality as a result:

Chrysalis has dominated Los Pegasus as well as Whitetail Wood and has moved on to attempting to invade Ponyville.

Nightmare Moon rules Ponyville from the Everfree Forest, she also hold control over the Badlands, and Baltimare.

Sombra holds the most control over the Frozen North and several smaller areas across Equestria including Vanhoover and Manehatten.

Celestia is still in control of Canterlot, Cloudsdale, Fillydelphia, and a small portion of Ponyville (without her sister knowing). But her army is just barely holding off the opposing forces.

Trapped in this new timeline with no way back, she and Spike must find a way to bring peace and harmony to this war-torn world, but what’s happened to their friends in this world? And what happened to Starlight Glimmer?

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Where does Twist come in?

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Risk: War for Equestria!

This sounds more like a setting for an RP thing like Equestria Divided.