Paishachi
Paishachi or Paisaci (IAST: Paiśācī) is a largely unattested literary language of the middle kingdoms of India mentioned in Prakrit and Sanskrit grammars of antiquity. It is generally grouped with the Prakrits, with which it shares some linguistic similarities, but is still not considered a spoken Prakrit by the grammarians because it was purely a literary language, and because of its archaicism.