Temporary hide-out of the Masked Man in the Dwarf Forests. The cave's whereabouts are to the northwest, between the Elf Empire and the Northern Kingdom, in the Northern Mountains. The entrance blends into the mountainside very well. After the events of A Grimm Warning, Rook and Cornelius follow the Masked Man and find him living in a cave with a collection of his books. They watch him use the portal potion to go inside the books to recruit his army of literary villains.