Filmmaker Karan Johar, who is making a film based on the popular book "Immortals of Meluha", believes that the movie adaptation will prove to be a game-changer for his banner Dharma Productions.

"For me, it is not just another film. I would say it would be a game-changer for Dharma Productions," the 40-year-old said here Thursday at the launch of the cover page of the third book of writer Amish Tripathi's Shiva trilogy, "Oath of the Vayuputras".

Tripathi's "Oath of the Vayuputras" is expected to be on stands by March 2013. The second book of his trilogy was titled "Secret of the Nagas".

Karan admits finalising the team for the film and handling the whole project will be a tough challenge.

"Internally, we have gone through the processes of really finding out exactly who the perfect team would be to write the script, because adapting this book is really a daunting task and (so is) putting it out on the celluloid," Karan said.

"It is not a film that you can commission to a writer and it will be ready in two or three months... you will get a first draft and second draft. It will probably be the greatest challenge that Dharma Productions has ever taken on," he added.

Asked what is his Meluha, the perfect land, Karan said: "Every movie I make, becomes my Meluha because to me, every film is therapeutic. Every film, I would say... it becomes a life at that point of time.


"So, we create a Meluha every time we put our vision on celluloid, and I think that would be any filmmaker's answer."

The book narrates the story of Shiva, a Tibetan refugee who is taken to Meluha as the king of Meluha believes in the legend that an outsider will be their saviour.