Another Base Pony OC, for fun

Well, the first of the, now really late, April Fools day submissions I promised.
What, I like to do base stuff for fun!
Well, this pony, whose colors were in fact inspired by Nightmare Moon (no relation, promise), in my head was supposed to be, like, one of a few students of a great magic user or maybe in some really advanced magic school or something. Well, she's like the one who, based on her talents, thinks that she's the best of the bunch and flaunts it in front of the other students. Her cutie mark had something to do with, like, conversing with ghosts or maybe necromancy. Honestly, I can hardly remember the original idea behind this design; after all, I only do them for fun, and started this one at least half a year ago. My computer crashing and whatnot, though I was able to save the pic, kinda put the damper on plans to finish it for a while.
My final thoughts are: someone, dear Gods, help me find the base I used for this again! Not because I want to use it again, I can salvage that, but because I can't remember where I got it and I want to properly credit the base-maker. I can't even remember the search terms I used to find it... Ugh. -n-;

My Little Pony: Friendship is Magic (c) Hasbro
Base: I don't know, I seriously need to figure this out! It's definitely not my base, I know that for sure!!
         EDIT: I found "A" base for this particular pose, obviously derived from the same scene, but the base layer on my progress versions of this pic doesn't match (and no, it obviously had no credits written on the original base). I'll put the version of the base I found here: chaostrical.deviantart.com/art… by but I'm certain this was not the ACTUAL base I used. It's still really good, though, and if you want to use it then do so and credit correctly!! I'll still look for the right base, as many people can make bases from the same scene.
         And for Chaostrical, sorry for the bother of the mention. I'm just having a crisis right now with this pic.