The Wild Hunt

First appearing in the first Witcher rpg, the Wild Hunt are a group of ghost like creatures that ride across the sky and abduct individuals. In the Witcher 2, it is revealed that they are responsible for kidnapping Yennifer, his love. Geralt, Letho, and two other Witchers from the school of the Viper pursue the hunt and eventually catch up with them. After the Witchers were defeated, Yennifer traded her soul to save Geralt. It is speculated that the Wild Hunt are actually a group of elves, but from another dimension, which is why they are impervious to the weapons of the Witchers. There current plans are unknown, but could involve anything from destroying the world to enslaving it.