Penumbra Quillauthor : Penumbra QuillPenumbra Quill Book SeriesCursed CrusadersMy Little Pony_Ponyville Mysteries_Peryton PanicMy Little Pony--Ponyville Mysteries--Riddle of the Rusty HorseshoeMy Little Pony--Ponyville Mysteries--Schoolhouse of SecretsMy Little Pony--Ponyville Mysteries--The Tail of the TimberwolfRiddle of the Rusty Horseshoe