It's like Avengers Infinity War , Endgame. It's about some parts of a stone and each has its own powers . When combined , it becomes Brahmastra ( The weapon of weapons ) . Ranbir gets 1 part ( Shiva ) , Nagarjuna Sir gets one part ( Nandi ( Lord Shiva's Ride ) ) , Mouni Roy gets one part ( Evil ) and maybe she wants to collect all other parts of that stone to control the universe ( just the way Thanos Did ) and some other people as well . Till End Ranbir Kills Mouni Roy and he has now Discovered his power
PART 1 Ends