Chandi di Var

Chandi di Var (lit. "Chandi's deeds") is a composition written by Guru Gobind Singh, included in the 5th chapter of "Dasam Granth". It is based on an episode from the Sanskrit work "Markandeya Purana", and describes the conflict between the Gods and the Demons. In the ballad, the supreme goddess (see Chandi) is transformed into a liberating divine power in the form of sword, that crushes perpetuators of falsehood.
The first part of the text, "Chandi Charitra Ukti Bilas", states it is retelling the "Markandeya Purana" story, where Durga fights a shape shifting buffalo demon Mahishasura and slays the evil demon and his companions. The second part repeats the same story, while part three of the text is a retelling of the "Durga Saptasati". The composition has been a significant part of Sikh culture, state Pashaura Singh and Louis Fenech, with its opening verses being a part of "frequently recited "ardas" prayer or petition".
Nomenclature.
The text has historically been referred to by several names. These include:
Authorship.
 "Chandi di Var" was written by Guru Gobind Singh at Anandpur Sahib. According to early Sikh historians such as Bhai Koer Singh Kalal, as mentioned in Gurbilas Patshahi 10 (1751), Chandi di Vaar was written by Guru Gobind Singh at Anandpur Sahib. Various other Sikh historians and scholars like Giani Ditt Singh, Professor Sahib Singh, Giani Gian Singh, Ratan Singh Bhangu, Kavi Santokh Singh also supported this fact.