Brahmāstra: Part One - Shiva Spin-off: The Varanasi lovers

Plot for Brahmastra

In ancient India, a group of sages in the Himalayas collide with the energy Brahm-shakti, which produces many celestial weapons of great power called astras. The strongest among them, the Brahmāstra, has the capacity to destroy the world. The sages use their respective astras to tame the unstable Brahmāstra and become the Brahmānsh, a secret society to protect the world from the powers of astras.

In present-day Mumbai, Shiva, a disc jockey, falls in love at first sight with Isha Chatterjee, a London resident who is visiting India for the Durga Puja festival at her grandfather's pandal. Soon, Isha reciprocates and expresses her feelings for Shiva. Shiva tells her that he is an orphan who never knew his father, and that his mother died in a fire when he was a baby. Meanwhile, in Delhi, scientist and Brahmānsh member Mohan Bhargav is attacked by Zor and Raftar for a piece of Brahmāstra he safeguards. Mohan fights back using the Vānarāstra but is ultimately subdued by Junoon, who works for the mysterious evil named Dev. Under Junoon's possession, Mohan reveals that the second piece of Brahmāstra is protected by an artist and archaeologist named Anish Shetty in Kashi. Before he can reveal the current location and guru of the Brahmānsh (Āshram), Mohan throws himself out of a balcony.

Shiva has a vision of Mohan's encounter with Junoon. He and Isha head for Kashi to warn Anish but are interrupted by Raftar, who now wields Mohan's Vānarāstra. Anish defeats him using the Nandi Astra before escaping with Shiva and Isha. While going to Himachal Pradesh, where Āshram is located, they are chased by Junoon and Zor in a truck. Anish gives the second piece of the Brahmāstra to Shiva and stays to fight Junoon and Zor, only to be killed. Shiva and Isha are chased by Raftar to Āshram where Shiva kills him using the Agnyāstra after he tried to kill Isha. At Āshram, they learn about other astras and Shiva is forced to join Brahmānsh by the guru Raghu for information on his parents. He meets other new recruits Rani, Raveena, Sher and Tenzing, who are all trained by Raghu on how to use their respective astras and Shiva also gains control over fire. As Junoon gets closer to them, Raghu reveals that Shiva is the son of former Brahmānsh members, Dev and Amrita. Dev actually awoke the Brahmāstra as he was the only person who was able to control multiple astras at once.

Dev's wife Amrita (pregnant with Dev's child), who wielded the Jalāstra, defeated Dev in a battle on a remote island and both of them seemingly perished from the battle. Amrita's boat was found in the ruins of the battle, brought back from the island, with two broken pieces of the Brahmāstra. The pieces of the Brahmāstra were given to both Mohan and Anish. The third piece was believed to be missing, with Raghu and Shiva concluding that they both survived the battle. The third piece of the Brahmāstra is in Amrita's Mayāstra disguised into a conch shell, which Raghu releases by dropping Shiva's blood on the conch. Junoon and her army arrive at Āshram for the Brahmāstra and hold everyone hostage. Shiva defeats Junoon while also killing Zor, who wielded Nandi Astra and releases everyone. But Junoon manages to take the third piece from Isha. She seemingly sacrifices herself to activate the Brahmāstra. The destruction starts to begin and Isha is in danger, but Shiva gains control over the Brahmāstra with newfound strength stemming from his protectiveness of Isha and reunites with her.

Before the credits, due to Junoon having activated the Brahmāstra, Dev, who was imprisoned as a statue on an unknown island, is released.

Source: https://en.wikipedia.org/wiki/Brahmāstra:_Part_One_–_Shiva