\defaultfontfeatures[erewhon]
  {
  Extension = .otf ,
  SlantedFont = Erewhon-RegularSlanted,
  BoldSlantedFont = Erewhon-BoldSlanted,
  BoldFont = Erewhon-Bold,
  ItalicFont = Erewhon-Italic,
  BoldItalicFont = Erewhon-BoldItalic,
  UprightFont = Erewhon-Regular,
 }