Nagin (1976)

While hunting in the jungle, one day, Vijay save the life of a young man from the sudden attack of a wild hawk. There and then Vijay realizes that he have just save the life of a miraculous snake who have the powers to take the form of a human and who have been dating his beloved; also a miraculous female snake. Vijay browse this news to his five friends who immediately shoot the male snake to death. Enraged at the brutal killing of her beloved; the female snake begins to take revenge on the six friends, killing them one by one by taking the form of humans. Now the only one who can save the six friends is a sage but it certainly looks like the miraculous snake might as well do away with all her enemies before the sage lay hands on her.