A small band of cultists have gotten together on this deep dark night where the stars have aligned to summon forth one of the Great Old Ones, armed and ready to bring Equestria, nay, all of Equus under their master's sway. Or that's what they planned.
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Cover art by Darkone10 http://darkone10.deviantart.com/art/Uncle-Cthulhu-Stops-By-335653237