There’s no question that Game of Thrones's final season will be action-packed. But Iceland native Hafþór Júlíus Björnsson, who plays Gregor "The Mountain" Clegane in the TV series, recently confirmed just how much more hardcore the upcoming episodes will be.

In a recent interview with Mashable, Björnsson dished on the final season (as much as an actor sworn to secrecy can dish about a show). Though he couldn’t reveal any really juicy details, he did spill a very interesting piece of information about The Mountain. According to the 30-year-old strongman, the final season was "the hardest season I’ve filmed for Game Of Thrones."

Filming got so complicated that, for the first time in his four seasons on the show, Björnsson needed a stunt double to play The Mountain.

“All the seasons prior to this season that we just finished filming, I never had stunt doubles. I always did everything myself," Björnsson said. "But the last season I filmed, the season that hasn’t been shown on television, I had a stunt double there."

Though fans certainly wanted to hear more about the scene (or scenes) that required a stunt double for the actor, Björnsson—much like The Mountain—didn't budge. “I can’t go into detail ... but I had a stunt double there I can tell you that,” he said. "He was big. He was tall, not as muscular."

It couldn’t have been easy for the show's producers to find a match for Björnsson, who is a professional strongman when he's not acting. He stands 6 feet 9 inches tall, and currently holds the title of "World’s Strongest Man."

As Björnsson has never needed a stunt double before, we can’t help but wonder what exactly happens to The Mountain in season 8. We'll be looking forward to finding out when Game of Thrones returns on April 14, 2019.

[h/t: Mashable]