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Season 3

Shivangi dies without getting to know why her father and husband betrayed her by plotting her murder. However, she vows to come back for her revenge.

Elsewhere in an old Haveli, Ruhi another Naagin, having gained the ability to shape-shift after hundred years of penance, dances with her lover Vikrant under the moonlight in the joy of their much anticipated union. However, business tycoon Andy Sehgal's spoiled sons Yuvi and Adi along with Yuvi's friends- Rehan, Daksh, RJ (Yuvi's brother-in-law) and Karan (Yuvi's family manager) arrive there drunk and misbehave with Ruhi and attempt to rape her, while Vikrant takes his Naag avatar to scare them off, but an agitated Adi shoots Vikrant who supposedly dies.

Ruhi vows to avenge her lover's death from the 6 murderers (Yuvi, Adi, Karan, Daksh, Rehan and RJ) along with the tag-alongs- Pratham, Bultu, Anu and Mahir. With Shivji's blessings, Ruhi performs a ritual and sheds off her skin to acquire a new identity, Bela, to materialize her revenge. What follows is Bela's quest to avenge her assault and gradually getting to know the real faces and intentions of people around her as she herself becomes the Queen of her clan and finds true love in Mahir.

source:

https://en.wikipedia.org/wiki/Naagin_(2015_TV_series)#Season_3