The new trailer of the fantasy epic, Brahmastra, starring Ranbir Kapoor, Alia Bhatt, and Amitabh Bachchan wows audiences

On Guru Purnima on Wednesday, Ayan Mukerji released a new behind-the-scenes featurette introducing audiences to the world of his upcoming film, Brahmastra. The fantasy epic is inspired by Indian mythology and introduces audiences to a new homegrown superhero.

Brahmāstra is a work of fiction. It celebrates Indian spirituality. On this very auspicious day of Guru Purnima, Ayan Mukherji wanted to share a little more in depth about the the concept of Brahmāstra – a movie through which he personally found himself transforming into a forever-student of the infinite wisdom that exists in our ancient Indian roots.

In the four-minute video, Ayan explains the film's premise, which he describes as the first instalment in a shared cinematic universe based on the concept of 'astras.' These 'astras,' or weapons, are based on the elements — earth, wind, fire, and water — and can even harness the power of animals like monkeys and bulls. But there is one 'astra' that is more potent than all of them: the 'Brahmastra.' The film 'begins with an image' of a group of sages meditating in the mountains and channelling the 'Brahm shakti.' These sages (who call themselves the Brahmansh) have remained hidden throughout history as a'secret society,' assisting humanity as it evolves and progresses.

Ayan concludes the video by explaining why his hero is named Shiva: he is a devotee of Lord Shiva, whom Ayan describes as "the God most dear to (him) personally, the most mystical, the all-powerful, and (his) greatest inspiration."

Part One of Brahmastra: On September 9, Shiva will be released in theatres. Amitabh Bachchan, Alia Bhatt, Nagarjuna, Mouni Roy, and others also appear in the film. The film will also be released in Tamil, Telugu, and Malayalam in an attempt to break into the South Indian markets.