The promotions of Ranbir Kapoor and Alia Bhatt's Brahmastra are well underway, but the audience was quick to notice Mouni Roy was missing from the promotions. Why? She finally joined the promotional event in Hyderabad yesterday, which was attended by SS Rajamouli and Jr. NTR.Mouni Roy plays a quintessential role in the movie, and as we all know, she is the antagonist. But of what kind? That's what the makers wish to keep as a surprise till the release. Her devious red look has already been released and she has a glimpse in the trailer as well, but that's not enough to make a guess.A source informs us, "The makers want to keep the audience in suspense about the main antagonist and what all she represents. They believe that Mouni Roy is the surprise weapon they want to keep under wraps to aid the story experience of the audience."