"That is what called you here, guided you here, to my home. A red moon is often called a Blood Moon in the vampiric tongue. It serves to a vampony as a guide, a guide to the castle. The fog you have been wandering through however, hides it from the rest of the mortal world. It can only be reached with the spell you fired to clear a path. If you don't fire the spell, you will never reach it, you just appear on the other side of it. It helps me to identify new vamponies and make a note for them, so we know how strong our numbers are. And it has appeared, you are the first one on over a decade... I already began to wonder why everything was so quiet with each Blood Moon. We are a dying breed, lady Rarity. Most of our kin being reduced to ash in the Dark Ages. The first five hundred years after the banishment."