Canine ComplicationsTwilight wakes up after a failed experiment and quickly finds out just how bad it failed. Can she make it as a predator in peaceful Ponyville?by Wages of Sin
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Hard ResetTwilight gives her life to stop a changeling invasion. Repeatedly.by Eakin
36,358 words
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The Guardian (K)NightDue to an occult ritual gone horribly right, Twilight Sparkle finds herself suddenly thrust head-first into the realm of the supernatural, for better or for worse. Will she become the hero Equestria needs, or will she become the very evil she fights?by InfiniteBrony
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Through a miscommunication between herself and her mentor, Twilight accidentally starts a war with the Griffon Empire. Well, maybe calling it a "war" is too generous...
Sunset Shimmer: Princess Twilight Sparkle's most faithful student. After bearing witness to the End of the World, she travels back in time to destroy the Dark Regalia and save her future. But a ghost from the past has other plans...
Seath the Scaleless was meant to be slain by the Chosen Undead, instead he finds himself wrenched from Lordran just before dying and abruptly tossed into a new role as the teacher of a kindred spirit: a pony called Twilight Sparkle.