As balwant said it is mentioned a naagin will kill veer .
As naageshwari vow to kill akesh in every birth , I guess it dint hold any value now coz indeed vani r saviour of each other.
D lady which is caged in basement is naagin who was after veer's life & is actual villain of d story, thou balwant said veer's mom was killed by a naagin which is false I guess.
Balwant said to mayuri aurat kisiko bhi nigal jaati hai chahe kitna bhi purana rishta kyu na ho , hints something else that he had some bad encounter with a woman.
Maybe veer's mom who was a naagin married veer's dad & later killed him , wanted to kill veer 2. Balwant is uncle & protector of veer.
Any way bani is saviour of veer from his kundali naagin.
D person caged in basement has blue colour eyes , only naag naagin colour varies , cheel gang has same colour.