Nandamuri Taraka Ratna, nephew of Balakrishna is all set to play a negative role opposite Balayya in the latter’s 100th film. According to a source, director Krishna Vamsi was keen to rope in Tarakaratna for the main villain role, which was later approved by Balakrishna. Nara Rohit also plays a key role in the film. “Balayya’s 100th film is all set to start soon.