Kalsarpika is none other than Moksh's mother Jyotsna. Suhagan Chudail doesn't want her adornments(shringars) and is ready to give it back to MahaAsur.After uniting with her true love she abandons everything. She wants to live a peaceful life. Finally MahaAsur came out in monster form. But evil MahaAsur won't let that happen. Vishdhar comes and warns Nishi to not give away her shringars since it's a trap by MahaAsur. He would take the shringars and also she has to sacrifice Shantanu's life. In return she won't get anything. Moksh pretends to unite with Nishi in order to save his family and Deeya. Moksh has to become Daanav. There is war between Chudail & MahaAsur. At last MahaAsur uses his most powerful weapon Tarkaastra which wounds Moksh. In order to save him from dying they have to get Naagmani from Naaglok. They take Moksh to the house. Jyotsna sees all this with magic as she is shape-shifting serpent. Jyotsna very cunningly takes away solah shringars from Smexy chudail and keeps it guarded in a box. As Deeya and Nishi set out in search of Naagmani in order to save Moksh's life. Only whose soul is pure can touch the Naagmani. That is Deeya. With the help of Nishi. They both reach there. Kalsarpika is not present over there. She comes home. Everyone is scared seeing such a huge Golden snake.
P. S. Deeya get the naagmani. Just then kalsarpika comes there and pushes Deeya Deeya comes to know that MaSa is kalsarpika and is shocked to see her
In N2 if you have seen Nidhi chachi the innocent one was the killer/culprit. I forgot to mention in earlier post that In N3 Sumitra Maahir's mother was the ichchadhari naagin who was also shown as good, kind woman at first. Makers have copied directly from there. Even in N3 they showed bhootni track which i hated the most. I hate the fact that they are showing naagin track in ghost story. I would have loved if they kept the originality intact.

She has come in form of Jyotsna. 
What if Maha Asur takes his life. I don't understand one thing. As a baby Moksh's life couldn't be revived. So Moksh ke papa brought him in front of the Maha Asur who gave him life. So now why Maha Asur against Moksh. Where was Jyotsna at that time. Mostly babies are with mothers and they accompany them wherever go. Shaitaan's make Fake promise
