So at school today I spent a lot of time thinking about that pony in priest's robes. I'm going to re-describe him in the following spoiler.
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He isn't wearing robes so much as an old, tattered, hooded coat, that gives off a faintly priestly (?) air. Around his neck his a faintly glowing old necklace. He's light grey-ish blue. His mane is black and stringy, giving him a slightly off balance look. This is not helped by eyes, which are quite small for a ponies.
Oh my gosh! You ponies must all be mind-controlled! The pony looks at Midnight. I see what your up to, you diabolical succubus! Your going to eat their souls, and then possibly eat their bodies as well! Well, it's not going to happen today! Although his words are confident, he gives off an aura of nervousness and manic excitement.