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The war for the Iron Throne will soon be joined on smartphones.

Game of Thrones: Conquest” — a massively multiplayer mobile strategy game based on HBO’s hit series — is slated to be released Oct. 19 on Apple’s App Store and Google Play. The game was developed by Warner Bros. Interactive Entertainment’s Turbine studio, under license from HBO. (The companies are Time Warner corporate siblings.)

In the game, you’re the head of a new House vying to take the Iron Throne. Players forge alliances and raise armies to crush enemies with force — or command their own small councils to sabotage foes from within, navigating Westeros’ backstabbing political landscape.

Game of Thrones: Conquest” (tagline: “Fight for the crown”) is free to download and play, offering in-app purchases to acquire gold, weapons, objects, speed-ups and other resources.

Players who pre-register for the game at the official site (gotconquest.com) will receive the Prepare for War bundle the first week of launch only. The bundle, which Warner Bros. Interactive Entertainment says carries a $50 value, includes Night’s Watch training gear as well as gold and resources.

“Game of Thrones” is HBO’s most-watched original series to date. Season 7 concluded in August, and the eighth and final season will air in late 2018 or early 2019.

A separate “Game of Thrones” episodic adventure game, developed by Telltale Games, was released in late 2014.

Watch the “Game of Thrones: Conquest” teaser trailer: