Not sure how common this is in MLP darkfic, but . . . by
doctorlit
on 2012-10-01 15:46:00 UTC
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. . . having some unknown number of characters secretly be changelings feeding off their "friends?"
Hm... by
firemagic
on 2012-09-30 18:22:00 UTC
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Let's see. Obviously, you have Pinkamena and Trollestia/Tyrantlestia.
You could go with Twilight's magic going out of control and hurting people, or with Trixie returning with new EVIL MAGICAL POWERS (tm) to seek revenge.
Re: Help with a Story Idea by
the Irish Samurai
on 2012-09-30 15:35:00 UTC
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Do you mean stuff that's common to grimdark in general, or specifically grimdark MLP? I haven't read that much MLP fanfic, but if you're going for grimdark in general, you can't go wrong with some kind of Inquisition (based on the one from Warhammer 40,000 for preference).