Phonological features
Northern Dravidian is characterized by the retraction of Proto Dravidian *k to /q/ before vowels other than /i(:)/ and later spirantizing in Brahui and Kurux, in return the *c also retracted to /k/ in the same environment. Initial *w's became b likely due to influence from eastern Indo Aryan languages. Brahui also has a voiceless lateral which formed after the merge of *ḷ to *l as there are words from both of them but the conditions of the split are not clear.References
Bibliography
* {{Eurasian languages Languages of India Dravidian languages