kash such as Basnyats , Bistas, karkis, khadgas were converted to chhetries. they migrated in Nepal before the chettery bhaun invasion from india later converted to chhetries because they were brainwashed by the bahuns that being khas and to live without wearing janai is one of the lowest status in the caste system. Now khas are almost extinct. they used to worship their own gods as kuldevtas who were not hindu gods. this is my understanding of khas. please correct me if i am wrong. Now the chhetries don't even like to call them khas and only worship their kuldevatas once in a while and mostly worship hindu gods as shown in indian channel.. so if there is any indigenous race in Nepal that is Khas.