Perhaps a better artist could try this:
Pretty sure it was in a book I read, I can't have imagined this myself. Was a black unicorn-ish thing. All black, but instead of fur or hair or w/e its called it had Chitin (like an insect, well, more like Alien from AvP) Black/dark green. The tail and mane were spiderwebs. It had no eyes, just a chitin face, smooth reflective and creepy. Had a unicorn horn, but it looks sharpened and serated. Also had Ram horns that looked sharp. Naturally, in my dream, it was trying to kill me, but it would be a really cool picture if someone could draw it. Gotta find what book I read it in, its gotta be somewhere.