LAS VEGAS — J.K. Rowling is passionate about her first screenwriting adventure.

The “Harry Potter” author opened up about her return to the Wizarding World writing “Fantastic Beasts and Where to Find Them” during a behind-the-scenes look at the adventure film at CinemaCon on Tuesday. While Rowling was not present at the Las Vegas event, “Fantastic Beasts” cast members were on hand to discuss Warner Bros. forthcoming epic.

“We had the most astounding time,” Eddie Redmayne, who leads as Newt Scamander, told the audience. He added that it was a noteworthy experience to be able to “enter her imagination” for the feature.

While “Fantastic Beasts” takes place in 1920s New York — several decades before Harry Potter’s trip to Hogwarts — Dan Fogler, who plays Jacob Kowalski, says audiences won’t be disappointed. “There’s so many unique things, new wizards, new witches and of course, fantastic beasts,” he said.

After the actors promoted the film, Rowling shared her thoughts on the project in a sneak peek. “I’ve always said never say never,” Rowling explained of her latest work. The 50-year-old best seller added that she was set on writing only seven “Harry Potter” books because she knew Warner Bros. might want to do something with “Fantastic Beasts,” her 2001 short story of the same name, some day. She said “Fantastic Beasts” was “the thing I was most interested in writing” and that she feels “very close to this project.”

While moviegoers will have to wait until November to see Rowling’s latest take on the magical world, producer David Heyman, who led all eight of the “Harry Potter” films, said the reimagining is both “lively” and “rich.”

“Fantastic Beasts and Where To Find Them” apparates into theaters on Nov. 18. Check out the trailer for the film below: