HBO plans to spend a whooping $15 million (N5.5 billion) on each episode of the eight season of its flagship TV show, Game of Thrones. 

Previous episodes of the show had cost $10 million, but with the final season to have feature-length episodes, the cost of production has taken a huge bump.

Part of the increased costs is being based on special effects, with an highly anticipated dragon-on-dragon battle between Drogon and his now undead brother, Viserion.

There’s also the filming of the great war, with all the armies set to clash, and would obviously take a lot of resources.

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HBO has revealed the names of directors for the final season, with familiar persons like Miguel Sapochnik (“The Battle of the Bastards” and “The Winds of Winter”) and David Nutter (“The Rains of Castamere”, “The Dance of Dragons” and “Mother’s Mercy”) to return for the last installment of the series.

Showrunners David Benioff and Dan Weiss, who previously directed episodes “Walk of Punishment” and “Two Swords”, will also serve as directors for season 8. They reportedly will be responsible for the final episode.

HBO has not announced whether the last season will air in 2018 or 2019. “Our production people are trying to figure out a timeline for the shoot and how much time the special effects take,” HBO’s president of programming Casey Bloys told The Hollywood Reporter.

Bloys also recently revealed that they planned to shoot multiple versions of the ending of season 8 to avoid leaks. “I know in ‘Game of Thrones’, the ending, they’re going to shoot multiple versions so that nobody really know what happens,” he said.