My Little Plotpony: Friendship is Fourth Thread

[Norgarth]

I think this is the one you were thinking of:

http://www.fimfiction.net...22654/My-Little-Lanterns

Yup, that's it.
There was an interesting side conversation in the SB thread, pro[posing that Equestria may have been a 'lab' to create anti-Lanterns (for all 7 colors) until some catastrope eliminated the experimenters..
Wendigo's to freeze/smother red rage
Changlings to 'spoof' violet love and steal their power.
Dragons trumping Orange greed (by consuming it's power)
Parasprites vs Indigo's compassion (I forget the reasoning)
The Ponies against Yellow
The Nightmare to defeat Blue hope
and Discord to bypass Green Will (because after Discord gets finish breaking the Lantern's mind, it won't matter how much Will he has)
It was also suggested that Discord amay well have been the 'catastrophe' that left the experiments running unsupervised. 
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"I've always wanted to be somebody, but I should have been more specific." - George Carlin